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/lib/arm/armfrag.s

@@ -11,17 +11,11 @@
 ;********************************************************************
 ; Original implementation:
 ;  Copyright (C) 2009 Robin Watts for Pinknoise Productions Ltd
-; last mod: $Id: armfrag.s 17481 2010-10-03 22:49:42Z tterribe $
+; last mod: $Id$
 ;********************************************************************
 
 	AREA	|.text|, CODE, READONLY
 
-	; Explicitly specifying alignment here because some versions of
-	; gas don't align code correctly. See
-	; http://lists.gnu.org/archive/html/bug-binutils/2011-06/msg00199.html
-	; https://bugzilla.mozilla.org/show_bug.cgi?id=920992
-	ALIGN
-
 	GET	armopts.s
 
 ; Vanilla ARM v4 versions
@@ -516,8 +510,7 @@ oc_frag_recon_intra_neon PROC
 	; r0 =       unsigned char *_dst
 	; r1 =       int            _ystride
 	; r2 = const ogg_int16_t    _residue[64]
-	MOV	r3, #128
-	VDUP.S16	Q0, r3
+	VMOV.I16	Q0, #128
 	VLDMIA	r2,  {D16-D31}	; D16= 3333222211110000 etc	; 9(8) cycles
 	VQADD.S16	Q8, Q8, Q0
 	VQADD.S16	Q9, Q9, Q0