[msan] Add interceptors: crypt, crypt_r.

Reviewers: vitalybuka

Subscribers: srhines, #sanitizers, llvm-commits

Tags: #sanitizers, #llvm

Differential Revision: https://reviews.llvm.org/D68431

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@373993 91177308-0d34-0410-b5e6-96231b3b80d8