FindQt4: Include builtin FindPackageHandleStandardArgs directly

Apply to FindQt4 change from commit b0118402 (Use absolute path to
FindPackageHandleStandardArgs.cmake everywhere, 2010-09-28).

Modules/FindQt4.cmake

@@ -354,7 +354,7 @@ ENDIF(QT_QT_LIBRARY)
 
 INCLUDE(CheckSymbolExists)
 INCLUDE(MacroAddFileDependencies)
-INCLUDE(FindPackageHandleStandardArgs)
+INCLUDE(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
 
 SET(QT_USE_FILE ${CMAKE_ROOT}/Modules/UseQt4.cmake)