snappy: upgraded package to upstream

Upgraded app-arch/snappy to version 1.1.7 on amd64, arm, x86

BUG=chromium:896357
TEST=for b in x86-generic coral arm64-generic; do
        FEATURES=test emerge-${b} -q --nodeps snappy; done
        + unit tests on coral

Change-Id: Id09e21878c9876bb85ad9c5fc8349bb6d61a7a3d
Reviewed-on: https://chromium-review.googlesource.com/1287023
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Georges Winkenbach <gwink@chromium.org>
Reviewed-by: Alec Thilenius <athilenius@google.com>
7 files changed