Try to fix the FreeBSD build.

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@217462 91177308-0d34-0410-b5e6-96231b3b80d8
Include the correct headers for kinfo_proc on FreeBSD.

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@217464 91177308-0d34-0410-b5e6-96231b3b80d8