Fix package generation

package directory was showing up in dmg file

QGCInstaller.pri

@@ -26,12 +26,12 @@ installer {
         # We cd to release directory so we can run macdeployqt without a path to the
         # qgroundcontrol.app file. If you specify a path to the .app file the symbolic
         # links to plugins will not be created correctly.
-        QMAKE_POST_LINK += && mkdir -p $${DESTDIR}/package
         QMAKE_POST_LINK += && cd $${DESTDIR} && $$dirname(QMAKE_QMAKE)/macdeployqt $${TARGET}.app -appstore-compliant -verbose=2 -qmldir=$${BASEDIR}/src
         # macdeploy is missing some relocations once in a while. "Fix" it:
         QMAKE_POST_LINK += && python $$BASEDIR/tools/osxrelocator.py $${TARGET}.app/Contents @rpath @executable_path/../Frameworks -r > /dev/null 2>&1
         # Create package
         QMAKE_POST_LINK += && hdiutil create /tmp/tmp.dmg -ov -volname "$${TARGET}-$${MAC_VERSION}" -fs HFS+ -srcfolder "$${DESTDIR}/"
+        QMAKE_POST_LINK += && mkdir -p $${DESTDIR}/package
         QMAKE_POST_LINK += && hdiutil convert /tmp/tmp.dmg -format UDBZ -o $${DESTDIR}/package/$${TARGET}.dmg
         QMAKE_POST_LINK += && rm /tmp/tmp.dmg
     }