Implement nexttoward and nextafterl; the latter is also known as

nexttowardl.  These are not needed on machines where long doubles
look like IEEE-754 doubles, so the implementation only supports
the usual long double formats with 15-bit exponents.

Anything bizarre, such as machines where floating-point and integer
data have different endianness, will cause problems.  This is the case
with big endian ia64 according to libc/ia64/_fpmath.h.  Please contact
me if you managed to get a machine running this way.

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