qmake only copy linux libs for installer

QGCSetup.pri

@@ -99,6 +99,7 @@ WindowsBuild {
 }
 
 LinuxBuild {
+    installer {
         QMAKE_POST_LINK += && mkdir -p $$DESTDIR/libs
 
         # QT_INSTALL_LIBS
@@ -132,8 +133,7 @@ LinuxBuild {
         }
 
         # QT_INSTALL_PLUGINS
-    QT_PLUGIN_LIST = \
+        QT_PLUGIN_LIST = platforms
-        platforms
 
         !contains(DEFINES, __rasp_pi2__) {
             QT_PLUGIN_LIST += xcbglintegrations
@@ -149,4 +149,5 @@ LinuxBuild {
         # QGroundControl start script
         QMAKE_POST_LINK += && $$QMAKE_COPY $$BASEDIR/deploy/qgroundcontrol-start.sh $$DESTDIR
     }
+}