add IEEE binary128 long double support to floatscan

just defining the necessary constants:

 LD_B1B_MAX is 2^113 - 1 in base 10^9
 KMAX is 2048 so the x array can hold up to 18432 decimal digits

(the worst case is converting 2^-16495 = 5^16495 * 10^-16495 to
binary, it requires the processing of int(log10(5)*16495)+1 = 11530
decimal digits after discarding the leading zeros, the conversion
requires some headroom in x, but KMAX is more than enough for that)

However this code is not optimal on archs with IEEE binary128
long double because the arithmetics is software emulated (on
all such platforms as far as i know) which means big and slow
strtod.

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