[sanitizer] Use confstr to check libc version in InitTlsSize

Reviewers: Lekensteyn, jakubjelinek

Subscribers: kubamracek, llvm-commits

Differential Revision: https://reviews.llvm.org/D48265

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@334912 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed