Include <pthread.h> to avoid compile errors in audiotest.

When using libc++, pthread.h does not get indirectly included.
Fixes compilation errors related to pthread.

In file included from /mnt/host/source/src/platform/audiotest/src/alsa_client.cc:5:
/mnt/host/source/src/platform/audiotest/include/alsa_client.h:77:5: error: use of undeclared identifier 'pthread_mutex_unlock'
     pthread_mutex_unlock(&mutexes_[last]);
    ^

BUG=chromium:724628
TEST=audiotest compiles with libc++ enabled.

Change-Id: I6b72667fc419149e074fa92c072e27461fb92567
Reviewed-on: https://chromium-review.googlesource.com/547777
Commit-Ready: Manoj Gupta <manojgupta@chromium.org>
Tested-by: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
1 file changed
tree: f83c905a3c5144f216adae9550ba6254430791bb
  1. include/
  2. src/
  3. Android.mk
  4. common.mk
  5. CPPLINT.cfg
  6. LICENSE
  7. Makefile
  8. README.txt