option to build the BGE without python, uses existing python check (cmake and scons)

when python is disabled videotextures are not built.

source/gameengine/GamePlayer/ghost/SConscript

@@ -40,9 +40,13 @@ incs = ['.',
         '#source/blender/gpu',
         '#extern/glew/include']
 
-incs += Split(env['BF_PYTHON_INC'])
-
 defs = []
+
+if env['WITH_BF_PYTHON']:
+	incs += ' ' + env['BF_PYTHON_INC']
+else:
+	defs.append('DISABLE_PYTHON')
+
 if env['WITH_BF_FFMPEG']:
     defs.append('WITH_FFMPEG')