av: Fix build in ISO C++11 mode

Change-Id: I461d8ce5b24afedee245a6441b600df286c76b63
Signed-off-by: Bernhard Rosenkraenzer <Bernhard.Rosenkranzer@linaro.org>
Signed-off-by: Chet Kener <Cl3Kener@gmail.com>

Conflicts:
	services/audioflinger/AudioResampler.h