[t] Skip native PBC tests with make testr.  There was code to do this, but it was in the wrong place and it wasn't actually working correctly.  Now it is.
[t] Skip native PBC tests with make testr.  There was code to do this, but it
was in the wrong place and it wasn't actually working correctly.  Now it is.

Now make testr works on GNU/Linux 32-bit x86.

git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@22920 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot