cmake: Search for Python 3.4

Fixes an issue where Python libraries aren't found on Ubuntu 14.04
because CMake 2.8 only searches up to Python 3.3.

cmake/Modules/FindPythonDeps.cmake

@@ -9,6 +9,7 @@
 #  PYTHON_INCLUDE_DIR
 
 if(NOT WIN32)
+	set(Python_ADDITIONAL_VERSIONS 3.4)
 	find_package(PythonLibs QUIET 3.4)
 	return()
 endif()