[v3] revamp header pedantic testing

[Steve Ellcey]

Benjamin,

I am getting some failures of these new (moved?) tests on ia64-hp-hpux11.23.
Have you heard of failures on any other platforms?

FAIL: 17_intro/headers/c++1998/all_pedantic_errors.cc (test for excess errors)
FAIL: 17_intro/headers/c++200x/all_no_exceptions.cc (test for excess errors)
FAIL: 17_intro/headers/c++200x/all_pedantic_errors.cc (test for excess errors)

I think the problem may be due to the fact that ia64-hp-hpux11.23 has
only a partial c99 implementation.  What is wierd is that if I compile
all_pedantic_errors.cc (which has nothing but '#include <bits/extc++.h>'
in it) using the just built compiler from its installed location, it
works fine. But it I compile it the way the test run does (with the -B's
and -I's, out of the build directory), then it fails.  I am trying to
figure out where the two compilations diverge but I was wondering if you
had any thoughts on this problem.

Steve Ellcey
sje@cup.hp.com