Add winmm proxy #34

Job	Run time
clang-format	16s
clang-tidy (clang-x64-release)	5m 30s
build-windows (clang-x86-release)	2m 11s
build-windows (msvc-x64-release)	1m 2s
build-windows (clang-x64-release)	2m 17s
build-ubuntu (clang-cross-x86-release, clang-cross)	2m 15s
build-windows (msvc-x86-release)	2m 32s
build-ubuntu (clang-cross-x64-release, clang-cross)	1m 59s
build-ubuntu (mingw-x86-release, mingw)	44s
build-ubuntu (llvm-mingw-x64-release, llvm-mingw)	1m 5s
build-ubuntu (mingw-x64-release, mingw)	1m 1s
build-ubuntu (llvm-mingw-x86-release, llvm-mingw)	56s
clang-tidy (clang-x86-release)	5m 32s
spelling	6s
release-draft-full	0s
	27m 26s

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