List myself in CREDITS as I did have some of code committed,

Add myself to PPC/OSX maintainers as this what I've been doing
for several month already, and Romain isn't active that much
these days


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@9304 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

CREDITS

@@ -31,6 +31,7 @@ Mike Melanson
 Loren Merritt
 Jeff Muizelaar
 Michael Niedermayer
+Guillaume Poirier
 François Revol
 Peter Ross
 Måns Rullgård

MAINTAINERS

@@ -253,7 +253,7 @@ Operating systems / CPU architectures
 Alpha                                   Mans Rullgard, Falk Hueffner
 BeOS                                    Francois Revol
 i386                                    Michael Niedermayer
-Mac OS X / PowerPC                      Romain Dolbeau
+Mac OS X / PowerPC                      Romain Dolbeau, Guillaume Poirier
 Amiga / PowerPC                         Colin Ward
 Linux / PowerPC                         Luca Barbato
 Windows MinGW                           Alex Beregszaszi