Updated prerelease for Xft and fontconfig

I've updated the tarballs containing Xft and fontconfig bits and have
included Xrender and Xft1 sources as well.  Those haven't been 
'autoconf'ized yet, so they only build with xmkmf.

Several significant changes have happened in the sources due to input from 
Owen in his quest for Xft2 support in Pango:

Xft:

+)	Unreferenced fonts are left around for a while in case they're reused

+)	Open fonts are placed in a hash table for quicker matches

+)	When using the core protocol for AA rendering, Xft was leaking
	the temporary image used to composite text.

Fontconfig:

+)	CharSets have been reimplemented to save memory and improve
	performance.  For a 4800 font test case, I reduce memory usage from
	6MB to 100KB for the coverage information.

+)	Lots of profiling driven changes converting a bunch of linear
	searches into hash tables or binary searches.  A quadratic
	loop over pattern pairs was also changed into a linear walk.
	
+)	FcFontSetSort performance was tuned; a list matching 'sans-serif'
	from my 383 font test set has improved from 10ms to 3.8ms.  If
	further performance improvements seem warrented, it would be
	quite reasonable to cache the search results; they're quite 
	compact, consisting of an array of pointers into the global font set.

+)	A FcFontSort API was added; it is to FcFontSetSort as FcFontMatch
	is to FcFontSetMatch.  This should be the preferred API for
	font list generation.

Other than that, I've done some pretty extensive cleanups in the build 
process, testing all of the libraries with xmkmf and Xft/fontconfig with 
autoconf on my Debian Woody box which is running XFree86 4.1.

So, unless Owen thinks Fontconfig should be caching pattern->font list
computations, I'm hoping Xft2 and fontconfig are nearing release.

Thanks to everyone for sending in bug reports and suggestions; there's no 
way I could have made this much progress so quickly without them.

Keith Packard        XFree86 Core Team        HP Cambridge Research Lab