fix: made the gtk_main call thread safe for win32
fix: made the gtk_main call thread safe for win32

turbopobre/gummi,bobi32/gummi,alexandervdm/gummi,bobi32/gummi,turbopobre/gummi,turbopobre/gummi,alexandervdm/gummi,mlda065/gummi,alexandervdm/gummi,turbopobre/gummi,mlda065/gummi,mlda065/gummi,bobi32/gummi,mlda065/gummi,bobi32/gummi