libvpx.recipe: Fix build with Visual Studio 2019
libvpx doesn't support building with VS 2019, so we use MinGW instead, but we must also remove MSVC-specific CFLAGS in that case. Fixes:
Unable to invoke compiler: gcc /utf-8 -fno-common -m32
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libvpx doesn't support building with VS 2019, so we use MinGW instead, but we must also remove MSVC-specific CFLAGS in that case. Fixes:
Unable to invoke compiler: gcc /utf-8 -fno-common -m32