futility: updater: Hacks to allow building futility on Reef

In Reef factory branch the compiler, dependency libraries and default
CFLAGS settings were different so we have to hack for FTW.
Also disable __USE_FILE_OFFSET64 for build breakage by fts.

BUG=b:119292628
TEST=make futil;

Change-Id: I93094d580bb8d28e7f6f8aee5e607a9857da06aa
Reviewed-on: https://chromium-review.googlesource.com/c/1348511
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Commit-Queue: Hung-Te Lin <hungte@chromium.org>
Tested-by: Hung-Te Lin <hungte@chromium.org>
Trybot-Ready: Hung-Te Lin <hungte@chromium.org>
5 files changed