vboot: remove support for _s suffixed binaries in Makefile

This suffix was used for static files, e.g. futility_s and
crossystem_s.

Since there's no longer any need to statically link any binaries
built by vboot_reference, remove this support from the Makefile.

BUG=b:124141368, chromium:765499
TEST=make clean && make runtests
BRANCH=none

Change-Id: Ia333c86e3466311b96bb111bb7e9a92789379792
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/1960185
Tested-by: Joel Kitching <kitching@chromium.org>
Auto-Submit: Joel Kitching <kitching@chromium.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Commit-Queue: Joel Kitching <kitching@chromium.org>
1 file changed