[v3] revamp header pedantic testing

[Benjamin Kosnik]

Recent patches and gcc-patches commentary indicated a weakness WRT
-std=gnu++0x and -pedantic and -pedantic-errors testing. Indeed, there
had been none of this, or -fno-exceptions testing which I thought had
been added many years previous. 

Fixed thusly.

This uses the precompiled/*.h includes to cut down on code
duplication while keeping these tests more accurate in the future.
That's the plan, at least.

Testing includes for -fno-exceptions has been added for both
C++ dialects.

tested x86_64/linux

-benjamin
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