Allow windows compilation using official espressif toolchain (msys2) #501

Job	Run time
build_luac_cross_win	1s
build (53, float)	34s
build (51, float)	1m 48s
build (51, integral)	1m 30s
luacheck (linux, ubuntu-22.04)	24s
build (53, 64bit)	1m 36s
luacheck (windows, windows-latest)	12s
doc_check	5s
compile_lua_win	0s
NTest_win	0s
NTest	0s
compile_lua	0s
	6m 10s

Provide feedback