[lldb] Support tests with nested make invocations on Windows 1/2 (llv…

…m#112342)

In recent PR llvm#111531 for
Windows support, we enabled tests that require the `make` tool. On
Windows, default install directories likely contain spaces, in this case
e.g. `C:\Program Files (x86)\GnuWin32\bin\make.exe`. It's typically
handled well by CMake, so that today invocations from `dotest.py` don't
cause issues. However, we also have nested invocations from a number of
Makefiles themselves. These still failed if the path to the `make` tool
contains spaces.

This patch attempts to fix the functionalities/completion test by adding
quotes in the respective Makefile. If it keeps passing on the bots, we can
roll out the fix to all affected tests.

lldb/test/API/functionalities/completion/Makefile

@@ -4,7 +4,7 @@ USE_LIBDL := 1
 a.out: lib_shared
 
 lib_shared:
-	$(MAKE) -f $(MAKEFILE_RULES) \
+	"$(MAKE)" -f $(MAKEFILE_RULES) \
 		DYLIB_ONLY=YES DYLIB_CXX_SOURCES=shared.cpp DYLIB_NAME=shared
 
 include Makefile.rules