[AC] Speed up XEmacs on X

Thanks for tracking this down.  I hadn't noticed it on Linux, and Mac
has been slower than Linux for a long time -- but with very long
lines in a LaTeX buffer, it's been excruciatingly slow.  This patch
not only makes XEmacs quite snappy, it also seems to improve
font-lock accuracy for reasons I don't understand.  (But I haven't
done any actual editing yet, just checked that scrolling speed and
search highlighting speed have improved by nearly 2 orders of
magnitude in that buffer!)

Michael Sperber writes:
 > 
 > I've pushed this one.
 > 
 > Michael Sperber <[email protected]> writes:
 > 
 > 2015-06-22  Michael Sperber  <[email protected]>
 > 
 > 	* lwlib-colors.h: 
 > 	* lwlib-colors.c (xft_convert_color_1): Introduce, and make
 > 	`xft_convert_color' use it.
 > 
 > 2015-06-22  Michael Sperber  <[email protected]>
 > 
 > 	* redisplay-xlike-inc.c (XFT_FROB_LISP_COLOR): Use
 > 	`xft_convert_color_1' instead of `xft_convert_color'.
 > 
 > -- 
 > Regards,
 > Mike
 > 
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