Issue #1962 - Update libtheora.

Removed some obsolete patches that were either backports from newer
 svn revisions, or a fix for older, non-applicable assemblers.
Update our own README to account for upstream's migration to git.
I didn't remove the bug 703135 patch as it's for MSVC it seems, and
 we still use MSVC for Windows.
Also deleted some unneeded upstream code deleted by Mozilla as well.

media/libtheora/AUTHORS

@@ -1,24 +1,25 @@
 Monty <monty@xiph.org>
 	- Original VP3 port
 
-Ralph Giles
 Timothy B. Terriberry
+Gregory Maxwell
+Ralph Giles
 Monty
 	- Ongoing development
-	
+
 Dan B. Miller
 	- Pre alpha3 development
-	
+
 Rudolf Marek
 Wim Tayman
 Dan Lenski
 Nils Pipenbrinck
 Monty
 	- MMX optimized functions
-	
+
 David Schleef
 	- C64x port
-	
+
 Aaron Colwell
 Thomas Vander Stichele
 Jan Gerber
@@ -26,8 +27,9 @@ Conrad Parker
 Cristian Adam
 Sebastian Pippin
 Simon Hosie
+Brad Smith
 	- Bug fixes, enhancements, build systems.
-	
+
 Mauricio Piacentini
 	- Original win32 projects and example ports
 	- VP3->Theora transcoder