regexp_benchmark doesn't need linkopts.

We haven't used clock_gettime(2) since August 2016, so we don't need to
link against librt. (And that wasn't needed since glibc 2.17 anyway...)
While I'm here, we don't need to link against libm either.

Change-Id: I050dcf74954b370332318913fe92f7acc5088077
Reviewed-on: https://code-review.googlesource.com/23790
Reviewed-by: Paul Wankadia <junyer@google.com>
2 files changed