Handle "incorrectly" cased msbuild property names

msbuild property names are case insensitive. While generating the custom
app.config, in `SetToolsetProperty(..)` we try to update the property if
it already exists. But the name lookup was case sensitive, thus causing
the lookup to fail, resulting in two entries for the same property name
differing only in case. Eg. `MSBuildSDKsPath` vs `MSBuildSdksPath`.

Fixed to ignore case.

Fixes mono/mono#14765 .

We need to turn off linking for mlaunch which lives in maccore, using the MSBUILD_VERBOSITY variable is the easiest way to do it.

This reverts commit 1d25751.

…ream

…blicSymbols test

We'd list the "LLVM failed" messages before even though the AOT might've crashed and the list is meaningless. Assert the exit code before that.

See mono/mono#14841 and mono/mono#9621

See mono/mono#14843

There are a number of tests that block in the BCL relatd to ssl, mono
issue mono/mono#14938 was added to track them.

maccore diff: https://github.com/xamarin/maccore/compare/454450958e601857ce244ccaa9a2f1a377dabc87..4cca112bc12be50ff3415652147e7e72eaea14e5

New commits in xamarin/macios-binaries:

* xamarin/macios-binaries@b474fa2 Bump mlaunch to xamarin/maccore@4cca112bc1 (#20)

macios-binaries diff: https://github.com/xamarin/macios-binaries/compare/718cef60c9c9226d54d0578126716804230db7c2..b474fa2e732974fde2edbfe054f23c5eefd0255b

Fixes xamarin/macios-binaries#20.

Fixes the confusion around `libmono-native*` (see for example ce5ba1e#commitcomment-33834491 ) when building with `MONO_BUILD_FROM_SOURCE=1`.

New commits in mono/mono:

* mono/mono@d707d745a61 [arm] set exception handling model to dwarf for iOS
* mono/mono@d0294cf5825 [aot] Fix a deadlock in init_plt () by calling create_trampoline () outside the lock.
* mono/mono@3b576e58c74 [arm64] Add location of this and rgctx arg
* mono/mono@2878c33dfef [arm] Add location of this and rgctx arg
* mono/mono@1398a3d33a1 [amd64] Fix location saving for *this*
* mono/mono@6bed4fc2ff5 [ci] One more workaround for Git 2.22.0 (#15325)
* mono/mono@f74dc9a395d [2019-06] [debugger] Debugger doesn't break on unhandled exceptions (#15286)
* mono/mono@b2987f714b5 Merge pull request #15292 from monojenkins/backport-pr-15255-to-2019-06
* mono/mono@b869c961ce5 [jit] Make alias analysis properly handle alias cloberring
* mono/mono@33796683990 [csproj] Update project files
* mono/mono@a49a3ea5530 Bump linker & cecil

Diff: https://github.com/mono/mono/compare/71e0854e2ae8aa0bbf3e8952b319916335a9641c..d707d745a6123d068ba070ca8bfeb38a94e9dc95

With 3e7bc29 the Mono hash was moved from Make.config to mono.mk.

We need to add a Makefile dependency on this file wherever Make.config was used to track a Mono dependency.

…sions everywhere.

Fixes this mtouch and mmptest failure:

    1) Failed : Xamarin.Tests.ProductTests.MinOSVersion(watchOS,MinwatchOS,WatchOSSimulator,False)
      Failures
      Expected: <empty>
      But was:  < "Unexpected minOS version (expected 2.0.0, alternatively 2.0.0, found 5.1.0) in /Users/builder/jenkins/workspace/xamarin-macios/xamarin-macios/_ios-build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/SDKs/Xamarin.WatchSimulator.sdk/usr/lib/libxamarin-debug.a (mono-runtime-debug.arm64_32.o).", "Unexpected minOS version (expected 2.0.0, alternatively 2.0.0, found 5.1.0) in /Users/builder/jenkins/workspace/xamarin-macios/xamarin-macios/_ios-build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/SDKs/Xamarin.WatchSimulator.sdk/usr/lib/libxamarin-debug.a (bindings-debug.arm64_32.o).", "Unexpected minOS version (expected 2.0.0, alternatively 2.0.0, found 5.1.0) in /Users/builder/jenkins/workspace/xamarin-macios/xamarin-macios/_ios-build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/SDKs/Xamarin.WatchSimulator.sdk/usr/lib/libxamarin-debug.a (bindings-generated-debug.arm64_32.o).", "Unexpected minOS version (expected 2.0.0, alternatively 2.0.0, found 5.1.0) in /Users/builder/jenkins/workspace/xamarin-macios/xamarin-macios/_ios-build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/SDKs/Xamarin.WatchSimulator.sdk/usr/lib/libxamarin-debug.a (shared-debug.arm64_32.o).", "Unexpected minOS version (expected 2.0.0, alternatively 2.0.0, found 5.1.0) in /Users/builder/jenkins/workspace/xamarin-macios/xamarin-macios/_ios-build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/SDKs/Xamarin.WatchSimulator.sdk/usr/lib/libxamarin-debug.a (runtime-debug.arm64_32.o).", "Unexpected minOS version (expected 2.0.0, alternatively 2.0.0, found 5.1.0) in /Users/builder/jenkins/workspace/xamarin-macios/xamarin-macios/_ios-build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/SDKs/Xamarin.WatchSimulator.sdk/usr/lib/libxamarin-debug.a (trampolines-debug.arm64_32.o).", "Unexpected minOS version (expected 2.0.0, alternatively 2.0.0, found 5.1.0) in /Users/builder/jenkins/workspace/xamarin-macios/xamarin-macios/_ios-build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/SDKs/Xamarin.WatchSimulator.sdk/usr/lib/libxamarin-debug.a (trampolines-invoke-debug.arm64_32.o).", "Unexpected minOS version (expected 2.0.0, alternatively 2.0.0, found 5.1.0) in /Users/builder/jenkins/workspace/xamarin-macios/xamarin-macios/_ios-build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/SDKs/Xamarin.WatchSimulator.sdk/usr/lib/libxamarin-debug.a (xamarin-support-debug.arm64_32.o).", "Unexpected minOS version (expected 2.0.0, alternatively 2.0.0, found 5.1.0) in /Users/builder/jenkins/workspace/xamarin-macios/xamarin-macios/_ios-build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/SDKs/Xamarin.WatchSimulator.sdk/usr/lib/libxamarin-debug.a (nsstring-localization-debug.arm64_32.o).", "Unexpected minOS version (expected 2.0.0, alternatively 2.0.0, found 5.1.0) in /Users/builder/jenkins/workspace/xamarin-macios/xamarin-macios/_ios-build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/SDKs/Xamarin.WatchSimulator.sdk/usr/lib/libxamarin-debug.a (trampolines-varargs-debug.arm64_32.o)."... >

… mono-2019-06

This reverts commit a560716.

The feature was disabled by default in the linker so we no longer need the workaround.

It needs an -r to remove directories:

```
rm: bin: is a directory
rm: obj: is a directory
```

They were listed as having the RemoteExecutor issue (which was fixed) but they actually fail for unrelated reasons so disable them again.