Cosmetic fixes to SCons buildsystem

- Removed trailing spaces
- Made sure all indentation is done using tabs (fixes #39)
- Potentially fixed an identation issue for openssl check

scene/3d/SCsub

@@ -4,10 +4,8 @@ Import('env')
 if (env["disable_3d"]=="yes"):
 
 	env.scene_sources.append("3d/spatial.cpp")
-	env.scene_sources.append("3d/skeleton.cpp")        
+	env.scene_sources.append("3d/skeleton.cpp")
 else:
 	env.add_source_files(env.scene_sources,"*.cpp")
 
 Export('env')
-
-