Removed mention of libsdl

BuildMac.sh

@@ -7,11 +7,10 @@
 # Xcode
 # py-ply
 # pkgconfig
-# libsdl (1.2)
 # cmake
 #
 # With macports you can easily install most of the needed libs with the following command:
-# sudo port install py-ply pkgconfig libsdl cmake
+# sudo port install py-ply pkgconfig cmake
 #
 
 #