* autogen.sh: Remove reference to obsolete ac-helpers/check-diff.sh
* autogen.sh: Remove reference to obsolete ac-helpers/check-diff.sh

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