spirv-cross: Don't build with NDEBUG even in Release build on Windows #55

Job	Run time
build (win-libs-vc14-x64, Visual Studio 16 2019, Release, windows-2019, -A x64, thirdparty-win64....	22m 42s
build (win-libs-vc14, Visual Studio 16 2019, Release, windows-2019, -A Win32, thirdparty-win32.zip)	22m 59s
build (darwin-libs-a, Unix Makefiles, Release, macos-latest, -DCMAKE_OSX_ARCHITECTURES="arm64;x86...	17m 44s
build (android-libs-arm64, Unix Makefiles, Release, ubuntu-latest, -DCMAKE_TOOLCHAIN_FILE=$ANDROI...	15m 1s
build (android-libs-arm, Unix Makefiles, Release, ubuntu-latest, -DCMAKE_TOOLCHAIN_FILE=$ANDROID_...	14m 35s
build (android-libs-x86_64, Unix Makefiles, Release, ubuntu-latest, -DCMAKE_TOOLCHAIN_FILE=$ANDRO...	17m 42s
build (android-libs-x86, Unix Makefiles, Release, ubuntu-latest, -DCMAKE_TOOLCHAIN_FILE=$ANDROID_...	15m 0s
	2h 5m 43s

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