centos-7: Add missing Qt5Multimedia runtime dependencies

centos-7/Dockerfile

@@ -100,6 +100,12 @@ RUN version=1.10.5 && \
 ENV Qt5_DIR /opt/qt5/5.12.6/gcc_64/lib/cmake/Qt5
 ADD qtifwsilent.qs /tmp/qtifwsilent.qs
 RUN version=5.12.6 && \
+    yum install -y \
+        pulseaudio-libs \
+        pulseaudio-libs-glib2 \
+        && \
+    yum clean all && \
+    source /etc/profile && \
     cd /tmp && \
     curl -sSLO https://download.qt.io/official_releases/qt/${version%.*}/${version}/qt-opensource-linux-x64-${version}.run && \
     chmod +x qt-opensource-linux-x64-${version}.run && \