Fix a bunch of compile time warnings and a build failure on ubuntu.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@189683 91177308-0d34-0410-b5e6-96231b3b80d8
Use /bin/sh on FreeBSD


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@189684 91177308-0d34-0410-b5e6-96231b3b80d8