pgsql: Extend man page installation hackery so that the man page section

Log Message:
-----------
Extend man page installation hackery so that the man page section is also
fixed up in the .so links.

Modified Files:
--------------
pgsql/doc:
Makefile (r1.33 -> r1.34)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/Makefile?r1=1.33&r2=1.34)