Add missing stdio.h header in files using scanf/sscanf function.
Various files in webrtc codebase use scanf/sscanf function without including stdio.h header file which is supposed to define it. This somehow works when using glibc, but fails with uClibc. Bug: webrtc:8641 Change-Id: Ie4ae17af32b32ed8cea567166b6b0e5193966995 Reviewed-on: https://webrtc-review.googlesource.com/32261 Commit-Queue: Stefan Holmer <stefan@webrtc.org> Reviewed-by: Erik Språng <sprang@webrtc.org> Reviewed-by: Stefan Holmer <stefan@webrtc.org> Cr-Commit-Position: refs/heads/master@{#21775}
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