[PATCH app-bitmap] config: remove unused XBITMAPS package check

[Alan Coopersmith]

Gaetan Nadon wrote:
> The xbitmaps has no headers or libs upon which this module depends.

Not true:
BitEdit.c:  #include <X11/bitmaps/xlogo16>

xbm bitmaps & xpm pixmaps are C header files in disguise (and
unfortunately without file suffixes to make them easy to spot) -
this is occasionally useful for building X apps, even though its a
horrible encoding format for images in general (while most image
formats try to compress image data, xbm & xpm actually embiggen it).

There's also a runtime dependency on a number of the bitmaps from
xbitmaps in the app-defaults file for the bitmap program.

-- 
	-Alan Coopersmith-        alan.coopersmith at oracle.com
	 Oracle Solaris Platform Engineering: X Window System