[v3] -pedantic-errors fixups

[Benjamin Kosnik]

This adds a test for -pedantic-errors, and fixes up various existing
issues. 

Some of these have to do with #include_next.

Some with C99 initializations.

Some with VLA use.

Probably all the tr1 includes (and parallel includes) should have
pragma GCC system_error. I'll do this if people think it wise.

Also, probably this pragma should not warn on C++ VLA issues, but this
is not the current behavior. I'll investigate and file a bug about this
in bugzilla.

tested x86/linux

-benjamin
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