* Use (u)intxx_t for (u)intxx typedefs for all platforms. * Always include stdint.h. * Add RTC_ prefix to ARCH_XXX macros. Chromium did the (u)intxx_t change in https://codereview.chromium.org/117323010 and https://codereview.chromium.org/639293007 BUG=chromium:468375 TBR=perkj@webrtc.org (for trivial talk/* changes) NOTRY=true NOPRESUBMIT=true Review URL: https://codereview.webrtc.org/1349213003 Cr-Commit-Position: refs/heads/master@{#9983}