Small memory-leak in MOD decoder

[Torbjörn Andersson]

It looks like I've put a small memory-leak in the MOD decoder. In 
MOD_close() I only call Player_Free(m->module), I never call free(m).

Ryan, I assume you've been busy elsewhere lately (working for money 
again, eh? ;-), but could you please make that change when you get the time?

(Ideally I'd also like to see the libtool and "test for MP3-ness" 
patches discussed in the past few days applied. I can't even build 
SDL_sound unless I use rev 1.1 of acinclude.m4 instead of 1.2, which 
makes it look as if we're in much worse shape than we really are.)

Torbjörn Andersson