Apply patches from Trac #1638, additional application hardening (not  bugfixes, but ignoring easy-to-catch cases of improper lib use) and one  more bitstream guard.
Apply patches from Trac #1638, additional application hardening (not 
bugfixes, but ignoring easy-to-catch cases of improper lib use) and one 
more bitstream guard.



git-svn-id: 03f0f1727258f1959b7b485b30a676bafdb78148@17027 0101bb08-14d6-0310-b084-bc0e0c8e3800

soundcloud/vorbis,soundcloud/vorbis,fcoulombe/vorbis,soundcloud/vorbis,fcoulombe/vorbis,fcoulombe/vorbis,fcoulombe/vorbis