Fix for Typeface.create(Typeface, style) semantics changed in KK

This is a fix for bug 11553661. The "closest match" heuristic for
resolving a typeface when an exact match was not found changed between
JB MR2 and KK, resulting in loss of custom typeface when StyleSpan was
applied. This patch reinstates the logic that had been present. Also
reported externally as:
https://code.google.com/p/android/issues/detail?id=61771

Change-Id: Ia432fca07c4bf3b830ee2487cd8f5267a9cfb7ff