Add UTF-8 filename support on Windows #337

Job	Run time
windows (windows-latest, v143, x64, Debug,Release, ON, ON, OpenGL+Vulkan, ON, ON, ON, YES, ON, OFF)	24m 0s
windows (windows-latest, v143, x64, Release, OFF, OFF, OFF, OFF, OFF, NO, OFF, OFF)	6m 16s
windows (windows-latest, v143, x64, Release, OFF, OFF, OFF, OFF, OFF, NO, OFF, ON)	6m 59s
windows (windows-latest, v143, x64, Release, OFF, OFF, OFF, OFF, OFF, NO, ON, ON)	5m 14s
windows (windows-latest, CLangCL, x64, Debug,Release, ON, ON, OpenGL+Vulkan, ON, ON, ON, YES, ON,...	42m 35s
windows (windows-latest, CLangCL, x64, Release, OFF, OFF, OFF, OFF, OFF, NO, OFF, OFF)	7m 28s
windows (windows-latest, CLangCL, x64, Release, OFF, OFF, OFF, OFF, OFF, NO, OFF, ON)	8m 47s
windows (windows-latest, CLangCL, x64, Release, OFF, OFF, OFF, OFF, OFF, NO, ON, ON)	7m 49s
windows (windows-2019, v142, x64, Debug,Release, ON, ON, OpenGL+Vulkan, ON, ON, ON, NO, ON, OFF, ...	25m 17s
windows (windows-latest, CLangCL, arm64, Debug,Release, ON, ON, OFF, ON, ON, ON, YES, Visual Stud...	23m 7s
	2h 37m 32s

Provide feedback