COMP: Use the correct cmake variable to check for QtWidget module in OTB

Code/Application/Mapla/CMakeLists.txt

@@ -118,7 +118,7 @@ target_link_libraries( mapla
   ${QT_QTMAIN_LIBRARY}
 )
 
-if( OTB_USE_QT4 )
+if( OTBQtWidget_LOADED )
   target_link_libraries( mapla
     Monteverdi2_ApplicationsWrapper
   )

Code/Application/Monteverdi2/CMakeLists.txt

@@ -89,7 +89,7 @@ target_link_libraries( Monteverdi2_Catalogue
   Monteverdi2_Gui
 )
 
-if (OTB_USE_QT4)
+if (OTBQtWidget_LOADED)
 target_link_libraries( Monteverdi2_Catalogue
   Monteverdi2_ApplicationsWrapper
 )

Code/Application/Mv2/CMakeLists.txt

@@ -89,7 +89,7 @@ target_link_libraries( Monteverdi2_Mv2
   Monteverdi2_Gui
   )
 
-if (OTB_USE_QT4)
+if (OTBQtWidget_LOADED)
   target_link_libraries( Monteverdi2_Mv2
     Monteverdi2_ApplicationsWrapper
     )

Code/Common/CMakeLists.txt

@@ -3,7 +3,7 @@
 add_subdirectory( Core )
 add_subdirectory( Gui )
 
-if (OTB_USE_QT4)
+if (OTBQtWidget_LOADED)
   message("-- Generating Qt Wrapped Applications.")
   add_subdirectory(ApplicationsWrapper)
 endif()