[libc] Add strlen to library entrypoints.

Reviewers: sivachandra, abrachet

Reviewed By: abrachet

Subscribers: mgorny, tschuett, libc-commits

Tags: #libc-project

Differential Revision: https://reviews.llvm.org/D79016

GitOrigin-RevId: 6b01964271b92e9986bcf9412254dcf65559bba8
1 file changed