Append _t to all sized types.
uint64 becomes uint64_t etc

Bug: libyuv:774
Test: try bots build on all platforms
Change-Id: Ide273d7f8012313d6610415d514a956d6f3a8cac
Reviewed-on: https://chromium-review.googlesource.com/879922Reviewed-by: Miguel Casas <mcasas@chromium.org>