Switch to Zig 0.10.1 as default

[alexrp]

https://github.com/ziglang/zig/milestone/16 https://github.com/ziglang/zig/milestone/18

[alexrp]

0.10.0 has been released.

Note this issue, however:

• win-x86 packaging is currently disabled due to an upstream issue zig-toolsets#15

I don't expect this to be a huge problem in practice since I doubt very many people build anything on win-x86 these days.

On the other hand, if this does cause trouble, we either have to remove win-x86 from the default RuntimeIdentifiers or wait for 0.10.1 before bumping the default ZigVersion.

[alexrp]

OK, looks like there are some regressions to cross-compilation in 0.10.0. We are probably best off going for 0.10.1.

• Linking to libc for i386-windows-gnu target fails (regression) ziglang/zig#12886
• zig cc -target <arch>-windows-gnu produces a large amount of warnings ziglang/zig#13384
• -Wdeprecated-non-prototype warning in musl's dlstart.c with zig cc main.c -target aarch64-linux-musl ziglang/zig#13385

[alexrp]

We may have to remove linux-musl-arm from the default RuntimeIdentifiers:

• llvm11: clang error when building c++ hello world on arm-linux-musleabi -mcpu=generic+v6kz (__libcpp_signed_lock_free) ziglang/zig#6573

[alexrp]

Looks like none of the blocking issues above were addressed in 0.10.1, which is the final planned release in the 0.10.x series. We'll have to skip Zig 0.10.x altogether...