more simplification of the dependency handling

cmake/AddQt.cmake

@@ -1,55 +0,0 @@
-if(NOT QT_FOUND)
-# --- QT5 ---
-  find_package(Qt5Core QUIET)
-  if(Qt5Core_FOUND)
-    find_package(Qt5Gui QUIET)
-    find_package(Qt5Widgets QUIET)
-    if(Qt5Gui_FOUND AND Qt5Widgets_FOUND)
-      set(QT5_FOUND ON)
-      set(QT_FOUND  ON)    
-    endif()
-  endif()
-endif()
-
-if(NOT QT_FOUND)
-# --- QT4 ---
-  find_package(Qt4 QUIET)
-  if(QT4_FOUND)
-    set(QT_FOUND TRUE)
-  endif()
-endif()
-
-
-
-if(QT_FOUND)
-  if(NOT QT5_FOUND)
-    message ( STATUS "Using Qt4")    
-    set( QT_VERSION_STRING "${QT_VERSION_MAJOR}.${QT_VERSION_MINOR}.${QT_VERSION_PATCH}")
-    set( QT_TARGETS "Qt4::QtGui")
-  else()
-    message ( STATUS "Using Qt5")
-    set( QT_VERSION_STRING ${Qt5Core_VERSION_STRING})
-    set( QT_TARGETS "Qt5::Gui;Qt5::Widgets")
-  endif()
-
-else()  
-  message ( STATUS "Qt Not Found")
-endif()
-
-
-#include some custom CMake util functions
-INCLUDE(CommonCMakeUtils)
-
-extract_target_properties(QT_TARGETS_DEPENDENCIES QT_TARGETS INTERFACE_LINK_LIBRARIES)
-set (QT_ALL_TARGETS ${QT_TARGETS} ${QT_TARGETS_DEPENDENCIES})
-list(REMOVE_DUPLICATES QT_ALL_TARGETS)
-extract_target_properties(QT_INCLUDE_DIRS QT_ALL_TARGETS INTERFACE_INCLUDE_DIRECTORIES)
-extract_target_properties(QT_COMPILE_DEFS QT_ALL_TARGETS INTERFACE_COMPILE_DEFINITIONS)
-
-IF(QT_FOUND )
-  MESSAGE(STATUS "QT Version:         ${QT_VERSION_STRING}")
-  MESSAGE(STATUS "QT_TARGETS:         ${QT_TARGETS}")
-  MESSAGE(STATUS "QT_ALL_TARGETS:     ${QT_ALL_TARGETS}")
-  MESSAGE(STATUS "QT_INCLUDE_DIRS:    ${QT_INCLUDE_DIRS}")
-  MESSAGE(STATUS "QT_COMPILE_DEFS:    ${QT_COMPILE_DEFS}")  
-ENDIF()