Make svn's ./configure stop looking for external diff/diff3 programs. Remove all auto-generated macros related to this idea. If users want…
Make svn's ./configure stop looking for external diff/diff3 programs.Remove all auto-generated macros related to this idea. If users wantto use an external diff program, they can run 'svn diff --diff-cmd'.* build/ac-diff-test/: delete this whole subdir.* configure.in: don't try to load gnu-diff.m4 anymore, it's gone. And don't try to run SVN_LIB_DIFFUTILS() anymore, it's gone.* svn_private_config.hw: remove all reference to the SVN_CLIENT_DIFF, SVN_CLIENT_DIFF3, SVN_DIFF3_HAS_DIFF_PROGRAM_ARG macros. * svn_io.h, io.c (svn_io_run_diff, svn_io_run_diff3): don't default to SVN_CLIENT_DIFF if diff_cmd parameter is null. Those macros no longer exist. Update public docstrings accordingly. (svn_private_config.h): no need to #include this anymore.* config_file.c (svn_config_ensure): diff-cmd and diff3-cmd examples no longer use SVN_CLIENT_DIFF/DIFF3 macros, which no longer exist. They now match the editor-cmd example.