Update for Linux->POSIX rename

Revision r147613 (2341d35) renamed this file with s/Linux/POSIX/, but
header guards and comments were not updated to match.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@184741 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed