ENH: Update PythonQt

$ git shortlog cbf890f..1afe4f8 --no-merges
Jean-Christophe Fillion-Robin (7):
      Fix compilation of test when PythonQt_Wrap_Qtcore option is disabled
      Remove unused call to qt4_wrap_ui/qt4_add_resources associated with PythonQt library
      Add macro pythonqt_wrap_cpp removing the need for qt version specific macros
      Re-factor code introducing qt_wrapped_libs variable
      Refactor handling of "generated_cpp_suffix".
      Add support for Qt5
      addDecorators: Check for null object

CMakeExternals/PythonQt.cmake

@@ -63,7 +63,7 @@ if(NOT DEFINED PYTHONQT_INSTALL_DIR)
     message(FATAL_ERROR "error: Python is required to build ${PROJECT_NAME}")
   endif()
 
-  set(revision_tag cbf890f8eda122b8dca8e67d2bf75e85640ab297)
+  set(revision_tag 1afe4f8906345063b25047652e8962f641010a55)
   if(${proj}_REVISION_TAG)
     set(revision_tag ${${proj}_REVISION_TAG})
   endif()