fixed double declaration of qtmain_android.cpp

Author: mbernasocchi

src/app/CMakeLists.txt

@@ -1,6 +1,5 @@
 SET(QGIS_APP_SRCS
   main.cpp
-  qtmain_android.cpp
   qgisapp.cpp
   qgisappinterface.cpp
   qgsabout.cpp