Add pg_regress init_file to pl/perl
Add pg_regress init_file to pl/perl

Commit 644b2a9d0bd8 synchronized our pl/perl with upstream and
tidied up the Makefile. Add the missing init_file which that
commit references for pg_regress.

yuanzhao/gpdb,rvs/gpdb,ashwinstar/gpdb,janebeckman/gpdb,cjcjameson/gpdb,rvs/gpdb,ashwinstar/gpdb,yuanzhao/gpdb,kaknikhil/gpdb,adam8157/gpdb,Quikling/gpdb,kaknikhil/gpdb,Chibin/gpdb,xinzweb/gpdb,edespino/gpdb,yuanzhao/gpdb,janebeckman/gpdb,kaknikhil/gpdb,rvs/gpdb,rvs/gpdb,50wu/gpdb,janebeckman/gpdb,edespino/gpdb,kaknikhil/gpdb,kaknikhil/gpdb,ashwinstar/gpdb,adam8157/gpdb,50wu/gpdb,greenplum-db/gpdb,rvs/gpdb,ashwinstar/gpdb,xinzweb/gpdb,yuanzhao/gpdb,cjcjameson/gpdb,xinzweb/gpdb,rvs/gpdb,greenplum-db/gpdb,Quikling/gpdb,Chibin/gpdb,50wu/gpdb,Chibin/gpdb,rvs/gpdb,yuanzhao/gpdb,Quikling/gpdb,ashwinstar/gpdb,jmcatamney/gpdb,janebeckman/gpdb,Chibin/gpdb,rvs/gpdb,kaknikhil/gpdb,adam8157/gpdb,Chibin/gpdb,adam8157/gpdb,cjcjameson/gpdb,lisakowen/gpdb,greenplum-db/gpdb,Quikling/gpdb,Chibin/gpdb,jmcatamney/gpdb,edespino/gpdb,cjcjameson/gpdb,jmcatamney/gpdb,greenplum-db/gpdb,edespino/gpdb,lisakowen/gpdb,xinzweb/gpdb,lisakowen/gpdb,rvs/gpdb,cjcjameson/gpdb,greenplum-db/gpdb,jmcatamney/gpdb,janebeckman/gpdb,edespino/gpdb,edespino/gpdb,Chibin/gpdb,ashwinstar/gpdb,lisakowen/gpdb,xinzweb/gpdb,cjcjameson/gpdb,kaknikhil/gpdb,lisakowen/gpdb,jmcatamney/gpdb,adam8157/gpdb,yuanzhao/gpdb,janebeckman/gpdb,edespino/gpdb,kaknikhil/gpdb,xinzweb/gpdb,kaknikhil/gpdb,xinzweb/gpdb,kaknikhil/gpdb,greenplum-db/gpdb,cjcjameson/gpdb,50wu/gpdb,adam8157/gpdb,xinzweb/gpdb,janebeckman/gpdb,cjcjameson/gpdb,janebeckman/gpdb,Chibin/gpdb,Quikling/gpdb,yuanzhao/gpdb,edespino/gpdb,50wu/gpdb,cjcjameson/gpdb,yuanzhao/gpdb,jmcatamney/gpdb,lisakowen/gpdb,yuanzhao/gpdb,Quikling/gpdb,janebeckman/gpdb,greenplum-db/gpdb,adam8157/gpdb,ashwinstar/gpdb,edespino/gpdb,janebeckman/gpdb,adam8157/gpdb,yuanzhao/gpdb,edespino/gpdb,rvs/gpdb,Quikling/gpdb,50wu/gpdb,cjcjameson/gpdb,Chibin/gpdb,jmcatamney/gpdb,greenplum-db/gpdb,Quikling/gpdb,50wu/gpdb,Quikling/gpdb,jmcatamney/gpdb,50wu/gpdb,Quikling/gpdb,ashwinstar/gpdb,Chibin/gpdb,lisakowen/gpdb,lisakowen/gpdb