[gstreamer:arm64-windows] build failure

[MarkVabulas]

Host Environment

• OS: Windows 10 Pro 21H1
• Compiler: MSVC v142 Visual Studio 2019 16.11.1

To Reproduce
Steps to reproduce the behavior:
./vcpkg --triplet=arm64-windows install gstreamer

Failure logs
Fails when trying to install x264, or fontconfig, depending on the order it tries to install them.

-- Building arm64-windows-dbg
CMake Error at scripts/cmake/vcpkg_execute_build_process.cmake:155 (message):
Command failed: D:/vcpkg/downloads/tools/msys2/2f5e2150b81fcd06/usr/bin/make.exe -j 13 --trace -f Makefile all
Working Directory: D:/vcpkg/buildtrees/fontconfig/arm64-windows-dbg
See logs for more information:
D:\vcpkg\buildtrees\fontconfig\build-arm64-windows-dbg-out.log
D:\vcpkg\buildtrees\fontconfig\build-arm64-windows-dbg-err.log

Call Stack (most recent call first):
scripts/cmake/vcpkg_build_make.cmake:190 (vcpkg_execute_build_process)
scripts/cmake/vcpkg_install_make.cmake:26 (vcpkg_build_make)
ports/fontconfig/portfile.cmake:47 (vcpkg_install_make)
scripts/ports.cmake:140 (include)

Error: Building package fontconfig:arm64-windows failed with: BUILD_FAILED
Please ensure you're using the latest portfiles with .\vcpkg update, then
submit an issue at https://github.com/Microsoft/vcpkg/issues including:
Package: fontconfig:arm64-windows
Vcpkg version: 2021-08-12-85ab112d5ee102bc6eac8cdbbfdd173a71374e04

Additional context
No other context. The arm64-windows builds should probably not try to build any of the items with mingw dependencies, because they couldn't be used anyway. See here for more information: [https://gstreamer.freedesktop.org/download/](GStreamer prebuild libraries download page) (Quote: "UWP apps cannot use plugins that use dependencies built with MinGW because of forbidden APIs. Hence, these plugins are omitted from the binaries.") I realize this says UWP, but arm64-windows doesn't really exist without some level of UWP awareness on supported operating systems.
Additionally, it's reported on vcpkg.io that fontconfig is not a supported arm64-windows port, but that gstreamer apparently does work.

[JackBoosY]

Yeah... the mingW doesn't fit uwp now.

[JackBoosY]

We should make fontconfig x264 to support arm, or add option x264 to gstreamer.