Support macOS for release builds

[elringus]

We're using NativeAOT-LLVM compiler for release builds and it doesn't provide a macOS target yet.

Afaik, the maintainers are open for PRs on that, so if anyone interested — please let them know.

Associated upstream issue: dotnet/runtimelab#2119

Once upstream is ready, we can add the macOS-related plumbing in these files:

bootsharp/src/cs/Bootsharp/Build/Bootsharp.targets

Lines 22 to 31 in bbf6b61

	<PackageDefinitions Condition="'$([MSBuild]::IsOSPlatform(`Windows`))' == 'true'"
	Include="$(BsLlvmDir)/runtime.win-x64.microsoft.dotnet.ilcompiler.llvm">
	<Name>runtime.win-x64.Microsoft.DotNet.ILCompiler.LLVM</Name>
	<ResolvedPath>$(BsLlvmDir)/runtime.win-x64.microsoft.dotnet.ilcompiler.llvm</ResolvedPath>
	</PackageDefinitions>
	<PackageDefinitions Condition="'$([MSBuild]::IsOSPlatform(`Linux`))' == 'true'"
	Include="$(BsLlvmDir)/runtime.linux-x64.microsoft.dotnet.ilcompiler.llvm">
	<Name>runtime.linux-x64.Microsoft.DotNet.ILCompiler.LLVM</Name>
	<ResolvedPath>$(BsLlvmDir)/runtime.linux-x64.microsoft.dotnet.ilcompiler.llvm</ResolvedPath>
	</PackageDefinitions>

bootsharp/src/cs/.scripts/llvm.sh

Lines 9 to 14 in 2346e99

	PACKAGES=(
	"microsoft.dotnet.ilcompiler.llvm"
	"runtime.browser-wasm.microsoft.dotnet.ilcompiler.llvm"
	"runtime.win-x64.microsoft.dotnet.ilcompiler.llvm"
	"runtime.linux-x64.microsoft.dotnet.ilcompiler.llvm"
	)

[OptimusPi]

Thank you!