frameworks/base: Fix compile errors

Fix ISO C++11 incompatibility in TextLayoutCache and
aliasing violation in FontRenderer

Change-Id: I19a9560737005e72f706c12c0ccfdcd0c7765b06
Signed-off-by: Bernhard Rosenkraenzer <Bernhard.Rosenkranzer@linaro.org>

Conflicts:
	libs/hwui/FontRenderer.cpp