Avoid unportable left shift construct

left shift of 9 by 28 places cannot be represented in type 'int'

Pass locale down to gethex as well.

Merge the new gdtoa: Note that the built-in tests fail the same way as with
the old gdtoa.

Don't coredump on out of memory conditions. This solution leaks, but gdtoa
is too complicated to fix. Try printf %99999999999.9999999999f 2

Const poisoning.

* Pacify compiler; delint.
* Add MI NetBSD definitions.
* Rename IEEE_{8087,MC68k} to IEEE_{LITTLE,BIG}_ENDIAN, as previously
done in strtod.c.
* Some const poisoning, more to follow.

Import gdtoa-2005-09-23; test suite will be imported separately.