* subversion/include/private/svn_diff_private.h: Add required includes.
* subversion/include/private/svn_diff_private.h: Add required includes.

Suggested by: gstein

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion