add %ghost to rpm spec %files /var/run/munge dir

Add the %ghost directive to the /var/run/munge directory in the rpm
spec %files list.

It has become increasingly common for /var/run to be mounted as tmpfs.
As such, the /var/run/munge directory is created in the init script
when the service is started.

munge.spec

@@ -194,7 +194,7 @@ if [ -x /sbin/ldconfig ]; then /sbin/ldconfig %{_libdir}; fi
 %config(noreplace) %{_sysconfdir}/*/*
 %dir %attr(0711,munge,munge) %{_localstatedir}/lib/munge
 %dir %attr(0700,munge,munge) %{_localstatedir}/log/munge
-%dir %attr(0755,munge,munge) %{_localstatedir}/run/munge
+%dir %attr(0755,munge,munge) %ghost %{_localstatedir}/run/munge
 %{_bindir}/*
 %{_sbindir}/*
 %{_mandir}/*[^3]/*