spec: drop the old %beta hack about %__os_install_post

This always was broken and the %__os_install_post macro was
redefined also for non-beta builds;  that's because
%{?x:%global y z} defines %y even when %x is zero.

If we really wanted this %beta/%post hack, it would have to look
similarly to:
%{lua:if rpm.expand("%beta") ~= "0" then rpm.define('...') end}
On the other hand, I'm not sure that this is actually needed
nowadays so I'm removing it completely.  Please let us know if you
happen to need the %__os_install_post redefinition.

Originally added by commit 9636c11b0d.

Version: 9.6.3-5

postgresql.spec

@@ -30,7 +30,6 @@
 # always get built.
 
 %{!?beta:%global beta 0}
-%{?beta:%global __os_install_post /usr/lib/rpm/brp-compress}
 
 %{!?test:%global test 1}
 %{!?upgrade:%global upgrade 1}
@@ -64,7 +63,7 @@ Summary: PostgreSQL client programs
 Name: postgresql
 %global majorversion 9.6
 Version: 9.6.3
-Release: 4%{?dist}
+Release: 5%{?dist}
 
 # The PostgreSQL license is very similar to other MIT licenses, but the OSI
 # recognizes it as an independent license, so we do as well.
@@ -1163,6 +1162,9 @@ make -C postgresql-setup-%{setup_version} check
 %endif
 
 %changelog
+* Wed Jun 21 2017 Pavel Raiskup <praiskup@redhat.com> - 9.6.3-5
+- drop the __os_install_post redefinition hack
+
 * Mon Jun 12 2017 Pavel Raiskup <praiskup@redhat.com> - 9.6.3-4
 - drop -DLINUX_OOM_SCORE_ADJ=0 define from CFLAGS (rhbz#1110969, rhbz#1436554)