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.h

@@ -14,6 +14,8 @@
 #ifndef COMMON_AUDIO_SIGNAL_PROCESSING_INCLUDE_SPL_INL_H_
 #define COMMON_AUDIO_SIGNAL_PROCESSING_INCLUDE_SPL_INL_H_
 
+#include <stdint.h>
+
 #include "rtc_base/compile_assert_c.h"
 
 extern const int8_t kWebRtcSpl_CountLeadingZeros32_Table[64];