floatformat.c: Include "config.h" and <string.h> if available.

floatformat.c: Include "config.h" and <string.h> if available.

	* floatformat.c: Include "config.h" and <string.h> if available.
	(INFINITY, NAN): Define if not defined by <math.h>.
	(floatformat_to_double): Handle NaN, infinity, and denormalized
	numbers.
	(floatformat_from_double): Likewise.
	(ieee_test): In debugging code, use little endian rather than big
	endian.  Correct tests to handle NaN and to check correct sign of
	zero.  Omit m68k extended test.
	(main): Add more debugging cases.

From-SVN: r74237