misc edits

- rename define DISABLE_SDL --> WITH_SDL (which was already used in some places)
- blenders interation preset was using orbit rather then turntable 3d view preference (different from factory defaults).
- tagged some unused rna args.

build_files/scons/tools/Blender.py

@@ -316,8 +316,8 @@ def creator(env):
     if env['WITH_BF_TIFF']:
         defs.append('WITH_TIFF')
 
-    if not env['WITH_BF_SDL']:
-        defs.append('DISABLE_SDL')
+    if env['WITH_BF_SDL']:
+        defs.append('WITH_SDL')
 
     if env['WITH_BF_PYTHON']:
         incs.append('#/source/blender/python')