Octave 64-bit for Windows can't parse long hex integers

[Francesco Potortì]

On Octave 4.0.1 64-bit compiled for Windows, downloaded today from
<http://www.tatsuromatsuoka.com/octave/Eng/Win/>, there seems to be a
bug when Octave parses long hex literals.  This is what I observe, is
this really a bug or am I missing something?

On Debian:

>> printf("%x\n", 123456789000)
1cbe991a08
>> format long; 0x1cbe991a08
ans =  123456789000


On Windows:

>> printf("%x\n", 123456789000)
1cbe991a08
>> format long; 0x1cbe991a08
ans =  4294967295

In practice, when parsing a hex literal bigger than 2^32-1, octave reads
it as 0xffffffff.

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