Allow windows compilation using official espressif toolchain (msys2) #504

Job	Run time
build_luac_cross_win	1s
build (53, float)	41s
build (51, float)	38s
luacheck (linux, ubuntu-22.04)	24s
luacheck (windows, windows-latest)	17s
build (51, integral)	29s
firmware_compilation_win (float, 5.1)	46s
firmware_compilation_win (float, 5.3)	44s
doc_check	5s
firmware_compilation_win (integral, 5.3)	48s
build (53, 64bit)	34s
firmware_compilation_win (integral, 5.1)	48s
firmware_compilation_win (64bit, 5.1)	49s
firmware_compilation_win (64bit, 5.3)	45s
NTest_win	0s
compile_lua_win	0s
compile_lua	0s
NTest	0s
	7m 49s

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