Followup f3e08b5: Actually clean python on systems with newer sip version

Author: m-kuhn

src/app/CMakeLists.txt

@@ -407,6 +407,7 @@ INCLUDE_DIRECTORIES(
   ${QWT_INCLUDE_DIR}
   ${QT_QTUITOOLS_INCLUDE_DIR}
   ${QEXTSERIALPORT_INCLUDE_DIR}
+  ${PYTHON_INCLUDE_PATH}
   ../analysis/raster ../analysis/openstreetmap
   ../core
   ../core/gps

src/app/qgisapp.cpp

@@ -17,6 +17,11 @@
  *                                                                         *
  ***************************************************************************/
 
+//
+// Include, so we can check for the sip version
+//
+#include <sip.h>
+
 //
 // QT4 includes make sure to use the new <CamelCase> style!
 //