[libc] [Obvious] Remove unneeded header in strchr.

Reviewers: sivachandra

Reviewed By: sivachandra

Subscribers: mgorny, tschuett, ecnelises, libc-commits

Tags: #libc-project

Differential Revision: https://reviews.llvm.org/D83589

GitOrigin-RevId: 7859242a3713eb84b57430625b2a70efe30efbf2
2 files changed