2.50: svn merge https://svn.blender.org/svnroot/bf-blender/trunk/blender -r18677:19317

Notes:
* Sequence transform strip uses G.scene global, this is commented
  out now, should be fixed.
* Etch-a-ton code was most difficult to merge. The files already in
  2.5 got merged, but no new files were added. Calls to these files
  are commented out with "XXX etch-a-ton". editarmature.c and
  transform_snap.c were complex to merge. Martin, please check?
* Game engine compiles and links again here for scons/make/cmake
  (player still fails to link).

source/blender/blenkernel/SConscript

@@ -28,6 +28,8 @@ if env['WITH_BF_QUICKTIME']:
 
 if env['WITH_BF_SDL']:
 	incs += ' ' + env['BF_SDL_INC']
+else:
+	defs += ' DISABLE_SDL'
 
 if env['WITH_BF_INTERNATIONAL']:
 	defs += ' WITH_FREETYPE2'