math.h was being implicitly included, which can break the build with
alternative libc implementations.
Bug: None
Change-Id: I969b320b65d0f44abb33d3e1036cfbcb859a4952
Reviewed-on: https://webrtc-review.googlesource.com/9384
Reviewed-by: Tommi <tommi@webrtc.org>
Commit-Queue: Raphael Kubo da Costa (rakuco) <raphael.kubo.da.costa@intel.com>
Cr-Commit-Position: refs/heads/master@{#20292}