Apply patch from RT 79977 to fix breakage caused by removal of PL_uid et al from perl 5.16.0. Not tested by committer (running on Windows, where the code is unused anyway), but the same thing has already been done for trunk (mod_perl 2) in revision 1344224.
perl/modperl/branches/1.x/Changes
perl/modperl/branches/1.x/src/modules/perl/perl_util.c