windows-build.sh: ensure that -static-libgcc is used with MSYS2 gcc #177

Job	Run time
Build and test with gcc -m32	1m 5s
Build and test with clang	49s
Build and test with ASAN enabled	1m 10s
Fuzz with wlfuzz (Windows)	5m 11s
Fuzz with libFuzzer (wim )	2m 44s
Fuzz with wlfuzz (Linux, none)	3m 3s
Fuzz with libFuzzer (wim --asan --ubsan)	2m 58s
Build and test with gcc	1m 8s
Fuzz with wlfuzz (Linux, ASAN)	2m 51s
Build and test on macOS	1m 49s
Fuzz with libFuzzer (encoding --asan --ubsan)	2m 54s
Fuzz with wlfuzz (Linux, UBSAN)	3m 17s
Fuzz with libFuzzer (xmlproc )	3m 1s
Run shellcheck	10s
Fuzz with libFuzzer (xmlproc --asan --ubsan)	3m 0s
Build and test with UBSAN enabled	1m 6s
Fuzz with libFuzzer (xml_windows --asan --ubsan)	2m 54s
Run win32-test-imagex-capture_and_apply.bat	2m 38s
Fuzz with libFuzzer (compress )	3m 1s
Build on Windows (MINGW32, mingw-w64-i686-gcc)	2m 19s
Fuzz with libFuzzer (compress --asan --ubsan)	3m 44s
Build on Windows (MINGW64, mingw-w64-x86_64-gcc)	2m 19s
Fuzz with libFuzzer (decompress )	3m 10s
Build on Windows (CLANG32, mingw-w64-clang-i686-clang)	2m 15s
Fuzz with libFuzzer (decompress --asan --ubsan)	4m 26s
Build on Windows (CLANG64, mingw-w64-clang-x86_64-clang)	2m 19s
Build on Windows (CLANGARM64, --install-prerequisites)	2m 18s
	1h 7m 39s

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