Fix SystemProperties in LayoutLib.

Not all System Properties were used via Build class. Also, properties
like SDK_INT which called SystemProperties directly were not initialized
properly.

This change is essentially cherry picking of the relevant parts from the
following commits:
984749bf75c9ce9d3401b8410ea7d6276544b6ee
167bc25bceea9280bbe4858db4cb8233f86ce325

Bug: http://b.android.com/73046
Change-Id: Ia0fb467ee6d5fdedda500d57d02be20006f115df