Fixed glib-compile-schemas #3003.
Fixed: glib-compile-schemas failed when the source directory has non Latin symbols, under MNGW64 on MS Windows platform.
Root cause: using g_option_context_parse is incorrect under the MS Windows platform due the it expects system codepage instead of UTF-8.
Resolution: using g_option_context_parse_strv when G_OS_WIN32 is defined with g_win32_get_command_line.
Closes #3003 (closed)