Define uint64 and int64 using long long.

This is to avoid typedef collisions with some compile configurations.
For more info, see
https://blogs.oracle.com/nike/entry/ilp64_lp64_llp64
http://www.unix.org/whitepapers/64bit.html

BUG=4497

Review URL: https://codereview.webrtc.org/1186093004

Cr-Commit-Position: refs/heads/master@{#9451}
5 files changed