Quote the compile flags for Qt 5

Otherwise, when the variable is empty it is an error.

Change-Id: I0523dcbdebaf86f1f5f089160b256562d9123002
Add Java callback when window is ready

http://www.paraview.org/Bug/view.php?id=14130

Change-Id: I3930df942416c1fe274414139fc8665e06de7ab5
Merge topic 'qt5-set-target-properties' into master

5c015117 Quote the compile flags for Qt 5
Merge topic '14130_add_java_window_ready_callback' into master

058b2c4d Add Java callback when window is ready