The function winMultiWindowGetTransientFor() crashes, due to a bogus pointer
dereference, but this fact was previously hidden by the function not being called!
Signed-off-by: Jon TURNEY <jon.turney@dronecode.org.uk>
change "foo.h" to <X11/foo.h> for core headers, e.g. X.h, Xpoll.h;
change "foo.h", "extensions/foo.h" and "X11/foo.h" to
<X11/extensions/foo.h> for extension headers, e.g. Xv.h;
change "foo.[ch]" to <X11/Xtrans/foo.[ch]> for Xtrans files.