fix strtod("-0x",NULL)

[Eric Blake]

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According to Jeff Johnston on 2/21/2008 8:59 AM:
|> strtod is required to parse out the longest sequence of the expected
|> form.  Since "-0x" is not a valid hex constant, strtod should fall
|> back and parse the valid "-0" as -0.0, rather than claiming that the
|> input is invalid and returning +0.0.  OK to apply?

And another one - strtod("nan()", ptr) should consume the () (per C99, the
n-char-sequence between the literal () is optional, not required).
Without the patch, ptr is set to str+3 instead of str+5.  OK to apply?

2008-02-29  Eric Blake  <ebb9@byu.net>

	Fix strtod("nan()", ptr).
	* libc/stdlib/gdtoa-hexnan.c (hexnan): When the optional
	n-char-sequence is omitted, still parse the ().

- --
Don't work too hard, make some time for fun as well!

Eric Blake             ebb9@byu.net
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