packaging: fix postun script for fedora

%postun -p /sbin/ldconfig is recommended if the only thing
present in the scriptlet is calling ldconfig. This is not the case
here. Source https://bugzilla.redhat.com/show_bug.cgi?id=1379030

Note: fix pipeline for fedora 29

Change-Id: I558f1f2c779cfc67331ebf98bd7c89610e322f74

docker/Dockerfile_fedora_29

@@ -7,6 +7,7 @@ RUN dnf clean all
 RUN dnf upgrade -y && \
     dnf install -y mesa-libgbm-devel mesa-dri-drivers && \
     dnf install -y libinput-devel && \
+    dnf install -y qt5-qtbase-5.11.1-7.fc29 qt5-linguist-5.11.1-2.fc29 qt5-qtbase-devel-5.11.1-7.fc29 && \
     dnf install -y \
         git \
         rpm-build \
@@ -60,6 +61,8 @@ RUN dnf upgrade -y && \
         openssl-static \
         sqlite-devel
 
+RUN echo "exclude=qt5-qtbase* qt5-linguist*" >> /etc/dnf/dnf.conf
+
 ADD scripts/build-package-fedora.sh /opt/build-package-fedora.sh
 
 CMD /opt/build-package-fedora.sh

packaging/rules/fedora/ring.spec

@@ -208,7 +208,8 @@ DESTDIR=%{buildroot} make -C client-gnome/build install
 /sbin/ldconfig
 /bin/touch --no-create %{_datadir}/icons/hicolor &>/dev/null || :
 
-%postun -p /sbin/ldconfig
+%postun
+/sbin/ldconfig
 
 #for < f24 we have to update the schema explicitly
 %if 0%{?fedora} < 24