Fixup ldconfig scriptlets

%ldconfig is not defined on F28+, so it's evaluated to "%ldconfig" as is
which is not valid shell command..

Fixes:
/var/tmp/rpm-tmp.RKCplJ: line 1: fg: no job control

Signed-off-by: Igor Gnatenko <ignatenkobrain@fedoraproject.org>

pulseaudio.spec

@@ -36,7 +36,7 @@
 Name:           pulseaudio
 Summary:        Improved Linux Sound Server
 Version:        %{pa_major}%{?pa_minor:.%{pa_minor}}
-Release:        14%{?snap:.%{snap}git%{shortcommit}}%{?dist}
+Release:        15%{?snap:.%{snap}git%{shortcommit}}%{?dist}
 License:        LGPLv2+
 URL:            http://www.freedesktop.org/wiki/Software/PulseAudio
 %if 0%{?gitrel}
@@ -454,7 +454,7 @@ exit 0
 ) ||:
 
 %post
-%ldconfig
+%{?ldconfig}
 %if 0%{?systemd_activation}
 %systemd_user_post pulseaudio.service
 %systemd_user_post pulseaudio.socket
@@ -698,6 +698,9 @@ exit 0
 
 
 %changelog
+* Mon Mar 05 2018 Igor Gnatenko <ignatenkobrain@fedoraproject.org> - 11.1-15
+- Fixup ldconfig scriptlets
+
 * Thu Mar 01 2018 Rex Dieter <rdieter@fedoraproject.org> - 11.1-14
 - use %%make_build, %%make_install
 - enable systemd socket/service activation on f28+ (and disable autospawn)