6fe7de90b9e4e466a5c2baadafd5f72d3203651d changed GNU toolchain,
and added new RUN line to test expected behavior.
The change is for GNU toolchain only, so this will fail other toolchain,
eg: AIX.
Update the test with -target to test GNU tool chain only.
error: unknown target triple 'unknown-unknown-hurd-gnu', please use -triple or -arch
Perhaps this should UNSUPPORTED aix if aix does not support -nostdinc++.