Add Recast build. #45

Job	Run time
build (win-libs-vc14-x64, Visual Studio 16 2019, Release, windows-2019, -A x64, thirdparty-win64....	13m 49s
build (win-libs-vc14, Visual Studio 16 2019, Release, windows-2019, -A Win32, thirdparty-win32.zip)	12m 59s
build (darwin-libs-a, Unix Makefiles, Release, macos-latest, -DCMAKE_OSX_ARCHITECTURES="arm64;x86...	42m 15s
build (android-libs-arm64, Unix Makefiles, Release, ubuntu-latest, -DCMAKE_TOOLCHAIN_FILE=$ANDROI...	14m 54s
build (android-libs-arm, Unix Makefiles, Release, ubuntu-latest, -DCMAKE_TOOLCHAIN_FILE=$ANDROID_...	14m 4s
build (android-libs-x86_64, Unix Makefiles, Release, ubuntu-latest, -DCMAKE_TOOLCHAIN_FILE=$ANDRO...	15m 10s
build (android-libs-x86, Unix Makefiles, Release, ubuntu-latest, -DCMAKE_TOOLCHAIN_FILE=$ANDROID_...	14m 7s
	2h 7m 18s

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