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
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