Remove 32bit MSYS2 mingw32 and clang32 build #272

Job	Run time
macos-x86_64	1m 30s
mingw (mingw64, x86_64)	2m 32s
linux-x86_64	1m 6s
linux (i386, i686, i686-linux-gnu, i386-linux-gnu)	1m 30s
mingw (ucrt64, ucrt-x86_64)	2m 31s
linux (armhf, armhf, arm-linux-gnueabihf, arm-linux-gnueabihf)	1m 25s
msvc (x86, Win32)	1m 45s
mingw (clang64, clang-x86_64)	2m 17s
linux (arm64, aarch64, aarch64-linux-gnu, aarch64-linux-gnu)	1m 26s
msvc (x64, x64)	1m 45s
msvc (arm64, ARM64)	1m 48s
	19m 35s

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