Download static ANGLE libs to link them in Windows and macOS builds

[akien-mga]

Draft, still need to test.

[akien-mga]

@bruvzg With those precompiled macOS libs, I'm having the same issue as for official MoltenVK when linking:

/root/osxcross/target/bin/arm64-apple-darwin22-c++ -o bin/godot.macos.editor.arm64 -arch arm64 -mmacosx-version-min=11.0 -framework Cocoa -framework Carbon -framework AudioUnit -framework CoreAudio -framework CoreMIDI -framew>
ld: warning: option -s is obsolete and being ignored
Undefined symbols for architecture arm64:
  "_objc_msgSend$GPUEndTime", referenced from:
      rx::mtl::CommandQueue::onCommandBufferCompleted(objc_object objcproto16MTLCommandBuffer*, unsigned long long, unsigned long long) in libANGLE.macos.arm64.a(mtl_command_buffer.macos.arm64.o)
  "_objc_msgSend$GPUStartTime", referenced from:
      rx::mtl::CommandQueue::onCommandBufferCompleted(objc_object objcproto16MTLCommandBuffer*, unsigned long long, unsigned long long) in libANGLE.macos.arm64.a(mtl_command_buffer.macos.arm64.o)
  "_objc_msgSend$UTF8String", referenced from:
      rx::DisplayMtl::initializeShaderLibrary() in libANGLE.macos.arm64.a(DisplayMtl.macos.arm64.o)
      rx::DisplayMtl::getRendererDescription() in libANGLE.macos.arm64.a(DisplayMtl.macos.arm64.o)
      rx::DisplayMtl::getVersionString(bool) in libANGLE.macos.arm64.a(DisplayMtl.macos.arm64.o)
      rx::mtl::CreateMslShader(rx::mtl::Context*, objc_object objcproto10MTLLibrary*, NSString*, MTLFunctionConstantValues*, objc_object objcproto11MTLFunction**) in libANGLE.macos.arm64.a(mtl_utils.macos.arm64.o)
      rx::(anonymous namespace)::CreateMslShaderLib(rx::ContextMtl*, gl::InfoLog&, rx::mtl::TranslatedShaderInfo*, std::__1::map<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, std::__1:>
      rx::mtl::FormatMetalErrorMessage(NSError*) in libANGLE.macos.arm64.a(mtl_common.macos.arm64.o)

Still using LLVM Clang 14 for now, I haven't done the switch yet to my WIP update to Apple Clang 15. I might focus on this next if that makes our life simpler.

[akien-mga]

Still using LLVM Clang 14 for now, I haven't done the switch yet to my WIP update to Apple Clang 15. I might focus on this next if that makes our life simpler.

Still having the same issue with Apple Clang (based on LLVM 15.0.0) via osxcross, with Xcode 14.3.1.

Edit: And same issue with Apple Clang based on LLVM 16.0.0, with Xcode 15.0.

[akien-mga]

With the new builds made by @bruvzg today, I could link successfully for both Windows and macOS: https://github.com/godotengine/godot-angle-static/releases/tag/chromium%2F6029