Add rev 3 of the ant rules.

For now they are the same as the r2.
Also modified SetupTask to deal better with older tools.

Change-Id: I22ff809ace3ff81fb6852a707165165a9b4ec88a
diff --git a/files/sdk.properties b/files/sdk.properties
index a48a85d..cf62029 100644
--- a/files/sdk.properties
+++ b/files/sdk.properties
@@ -1,4 +1,6 @@
 # SDK properties
+# This file is copied in the root folder of each platform component.
+# If it used by various tools to figure out what the platform can do.
 sdk.build.support.library=true
-sdk.ant.build.revision=2
+sdk.ant.build.revision=3
 sdk.ant.templates.revision=1
\ No newline at end of file