Get rid of a number of unnecessary env.Clones.

Use SCons' convenient # shorthand for the root of our tree.
 
Also various minor cleanup of SConscripts.


git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@5915 8ced0084-cf51-0410-be5f-012b33b47a6e

Externals/SFML/src/SConscript

@@ -1,9 +1,8 @@
-# -*- python -*- 
+# -*- python -*-
 
 Import('env')
-import sys
 
-files = [ 
+files = [
 	"SFML/Network/Ftp.cpp",
 	"SFML/Network/Http.cpp",
 	"SFML/Network/IPAddress.cpp",