Patch to cache id3 info

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I'm just submitting this for everyone's approval... And, perhaps to shake
bugs out etc. (It seems to work here...)

I have nearly 17000 mp3s, and it was taking approximately 5 minutes to
start apache... So...

My patch writes the id3/md5sums out to a cache file, based on either the
directory being served or the playlist being served.

Here are the stats for _my_ system:

First run
	[root@cablemodem init.d]# time ./httpd start
	Starting httpd: /usr/local/apache/bin/apachectl startssl: httpd started

	2.07user 6.68system 5:31.06elapsed 2%CPU (0avgtext+0avgdata 0maxresident)k
	0inputs+0outputs (34150major+5349minor)pagefaults 0swaps

Second run,
	[root@cablemodem init.d]# time ./httpd start
	Starting httpd: /usr/local/apache/bin/apachectl startssl: httpd started

	0.91user 2.34system 0:03.44elapsed 94%CPU (0avgtext+0avgdata 0maxresident)k
	0inputs+0outputs (2259major+3804minor)pagefaults 0swaps

As you can see: startup time goes from 5 and a half minutes to 3.44 seconds.

Everything APPEARS to work, though, I have questions which I will post in
a later email...

I'm storing it internally as an AVL tree... (Which is what I'm most
suspicious of.)

Synopsis:
	New files:
		mod_mp3-0.38-binesh/src/cached_mp3_data.c
		mod_mp3-0.38-binesh/src/cached_mp3_data.h

	Changed file:
		mod_mp3-0.38-binesh/src/load.c
		mod_mp3-0.38-binesh/src/internal_dispatch.c
		mod_mp3-0.38-binesh/Makefile.STATIC
		mod_mp3-0.38-binesh/Makefile.tmpl
		mod_mp3-0.38-binesh/configure

internal_dispatch, all I did was a tiny tiny (what I perceive to be)
bug fix... Basically, if you didn't search for anything, mod_mp3 was coring
for me...  So, I simply check to see if signatures is null before
checking if signatures->nelts == max...

The meat of the changes is really load.c and cached_mp3_data.[ch]

Also, since I have apxs, I haven't really tested the Makefiles...

Feedback appreciated...
Binesh Bannerjee

- --
The measure of love is what one is willing to give up for it.

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