PgCommon.pm: Fix infinite recursion in get_program_path if...

PgCommon.pm: Fix infinite recursion in get_program_path if /usr/lib/postgresql/ contains a non-version directory. Patch by ITANI Eiichiro, thanks! (Closes: #940220)
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passed #330833
buster
buster

00:04:43

passed #330835
centos7
centos7

00:04:09

passed #330832
sid

00:07:13

passed #330834
stretch
stretch

00:04:46