Linaro string handling routines: Bring back the older method and

make the newer method opt-in.  The newer version causes a race condition
with grouper and probably other devices, but fixes camera on gnex
Use export USE_NEW_MEMCPY=true
to enable the newer method

Signed-off-by:  Paul Beeler <sparksco@gmail.com>
Fix assembler error using newer toolchains.
Fixes a ".size expression for pow does not evaluate to a constant" assembler error using linaro 4.7.x.