Remove duplicate gui/effects include

Author: nyalldawson

python/CMakeLists.txt

@@ -149,7 +149,6 @@ SET(SIP_CORE_CPP_FILES ${cpp_files})
 INCLUDE_DIRECTORIES(
   ../src/gui
   ../src/gui/symbology-ng
-  ../src/gui/effects
   ../src/plugins
   ${CMAKE_BINARY_DIR}/src/gui
   ${CMAKE_BINARY_DIR}/src/ui