Update encoder version string for the last change date in prep for the

1.0alpha8 release.

svn path=/trunk/theora/; revision=13850

CHANGES

-libtheora 1.0alpha8 (unreleased)
+libtheora 1.0alpha8 (2007 September 18)
 
  - Switch to new spec compliant decoder from theora-exp branch.
    Written by Dr. Timothy Terriberry.

lib/internal.h

@@ -41,7 +41,7 @@
 # endif
 
 /*This library's version.*/
-# define OC_VENDOR_STRING "Xiph.Org libTheora I 20060526 3 2 0"
+# define OC_VENDOR_STRING "Xiph.Org libTheora I 20070823 3 2 0"
 
 /*Theora bitstream version.*/
 # define TH_VERSION_MAJOR (3)