* configure.in: Better error messages in case GNU diff or patch cannot be found.
* configure.in: Better error messages in case GNU diff or patch cannot
be found.

This resolves issue #564.

Thanks to Barry Scott <barryscott@tigris.org> for the report.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@840665 13f79535-47bb-0310-9956-ffa450edef68

wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion