Allow windows compilation using official espressif toolchain (msys2) #503

Job	Run time
build_luac_cross_win	1s
build (53, float)	24s
build (51, integral)	1m 46s
build (51, float)	38s
doc_check	6s
luacheck (windows, windows-latest)	12s
build (53, 64bit)	1m 22s
luacheck (linux, ubuntu-22.04)	20s
NTest_win	0s
compile_lua_win	0s
NTest	-1s
compile_lua	-1s
	4m 47s

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