Add optimized sincos() function (ported from linaro_android_4.2.2)

Change-Id: I77f84d7ebc2dd7d5aa352b108b05e2651b5605c1
Signed-off-by: Bernhard Rosenkränzer <Bernhard.Rosenkranzer@linaro.org>
Adjust includes in sincos() for their 4.3 paths

Change-Id: I225654a9d623720d7f1eda38d0dbb052e73b0227
Signed-off-by: Bernhard Rosenkränzer <Bernhard.Rosenkranzer@linaro.org>