[RFC] tgmath.h and math/Makefile refactor

[Paul E. Murphy]

These are two separate smaller patches, inching towards the goal of
supporting more FP types in libm.

I spent some time trying to figure out tgmath.h, and how it might look
with support for arbitrary types.  It assumes __builtin_types_compatible_p
and Statement Expr's are supported by GCC (I'm not sure when these were
added).  These macros might make a good basis for supporting the
classification macros in math.h.

The potential Makefile changes by comparison are rather self-explanatory.
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