Bump to WebRTC M120 release

Some API deprecation -- ExperimentalAgc and ExperimentalNs are gone.
We're continuing to carry iSAC even though it's gone upstream, but maybe
we'll want to drop that soon.

webrtc/common_audio/signal_processing/include/spl_inl_armv7.h

@@ -15,6 +15,8 @@
 #ifndef COMMON_AUDIO_SIGNAL_PROCESSING_INCLUDE_SPL_INL_ARMV7_H_
 #define COMMON_AUDIO_SIGNAL_PROCESSING_INCLUDE_SPL_INL_ARMV7_H_
 
+#include <stdint.h>
+
 /* TODO(kma): Replace some assembly code with GCC intrinsics
  * (e.g. __builtin_clz).
  */