Add support for '-x -p' (--show-c-function) to 'svnlook diff'.
Add support for '-x -p' (--show-c-function) to 'svnlook diff'.

* subversion/svnlook/main.c
  (apr_getopt_option_t): Add explanation of -p to the help text of the -x
   option (copy-n-paste from svn/main.c).
  (print_diff_tree): Use the opts->show_c_function flag in the call to
   svn_diff_file_output_unified3, instead of always passing FALSE.

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