Bug 1448115 Update libtheora metadata to reference it's new(ish) git repository
The git commit for the subversion revision mentioned is
https://git.xiph.org/?p=theora.git;a=commit;h=74b57560775804bf248e3e5b4e57964112ccd7af
MozReview-Commit-ID: KPbMqgUXYAb
--- a/media/libtheora/README_MOZILLA
+++ b/media/libtheora/README_MOZILLA
@@ -1,5 +1,5 @@
-The source from this directory was copied from the theora subversion trunk
+The source from this directory was copied from the theora git master
using the update.sh script. The changes made were those applied by update.sh,
the addition/update of Makefile.in files for the Mozilla build system.
-The subversion revision used was r17578.
+The git commit used was 74b57560775804bf248e3e5b4e57964112ccd7af
