Fix two -Wsystem-header warnings in libc++ that were exposed by the new ATF import.  These have also been sent upstream.
Fix two -Wsystem-header warnings in libc++ that were exposed by the new
ATF import.  These have also been sent upstream.

MFC after:	1 month

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase