Clean up shared_foo handling.

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@7183 8ced0084-cf51-0410-be5f-012b33b47a6e

Externals/libpng/SConscript

@@ -4,8 +4,6 @@ Import('env')
 import sys
 
 if env.has_key('shared_png') and env['shared_png']:
-	# Currently using libwxpng in the shared case
-	#env['LIBS'] += ['png']
 	Return()
 
 files = [