Drop msys2 clang32 build #1663

Job	Run time
build-llvm_i686_msvcrt_Release	28s
build-msbuild_cl_x86_Release	11s
build-llvm_i686_msvcrt_Debug	16s
build-msys2_mingw32_gcc_Release	1s
build-msbuild_cl_x86_Debug	9s
changelog-hlf-checks	1s
build-llvm_i686_ucrt_Release	17s
build-msys2_mingw32_gcc_Debug	1s
build-msbuild_cl_x64_Release	14s
build-msys2_mingw32_clang_Release	1s
build-msbuild_cl_x64_Debug	13s
build-llvm_i686_ucrt_Debug	17s
build-msbuild_cl_ARM64_Release	14s
build-msys2_mingw32_clang_Debug	1s
build-llvm_x86_64_msvcrt_Release	14s
code-style-checks	1s
build-nmake_cl_x86_Release	1s
build-llvm_x86_64_msvcrt_Debug	17s
build-msys2_mingw64_gcc_Release	1s
build-nmake_cl_x86_Debug	1s
build-llvm_x86_64_ucrt_Release	14s
build-msys2_mingw64_gcc_Debug	1s
build-llvm_x86_64_ucrt_Debug	17s
build-msys2_mingw64_clang_Release	1s
build-nmake_cl_x64_Release	17s
build-llvm_armv7_ucrt_Release	21s
build-nmake_cl_x64_Debug	17s
build-msys2_mingw64_clang_Debug	1s
build-llvm_armv7_ucrt_Debug	21s
build-nmake_clang_x64_Release	1s
build-msys2_ucrt64_gcc_Release	1s
build-llvm_aarch64_ucrt_Release	18s
build-nmake_clang_x64_Debug	1s
build-msys2_ucrt64_gcc_Debug	1s
build-llvm_aarch64_ucrt_Debug	21s
build-msys2_ucrt64_clang_Release	1s
build-msys2_ucrt64_clang_Debug	1s
build-msys2_clang64_clang_Release	1s
build-msys2_clang64_clang_Debug	1s
	5m 36s

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