* font.h (struct font_driver): Remove get_outline and free_outline;

* font.h (struct font_driver): Remove get_outline and free_outline;
not used by any font driver.
* ftfont.c (ftfont_driver):
* macfont.m (macfont_driver):
* nsfont.m (nsfont_driver):
* w32font.c (w32font_driver):
* w32uniscribe.c (uniscribe_font_driver):
* xfont.c (xfont_driver): Related users changed.
* xselect.c (x_get_window_property): Use convenient xmalloc.
Call to xfree only if some data was really allocated.