PATCH: Relax one test in 18_support/numeric_limits.cc for FreeBSD only

[Gabriel Dos Reis]

Loren James Rittle <rittle@latour.rsch.comm.mot.com> writes:

[...]

| This program:
| 
| main() {printf ("%d\n", sizeof (long double));}
| 
| as compiled with the system compiler (also gcc but not 3.0 with
| libstdc++-v3):
| 
| $ a.out
| 12
| 
| as compiled with gcc 3.1 (prerelease) from FSF sources:
| 
| $ a.out
| 12

Thanks Loren.

  I suppose it is a dream to think that, on the mentioned OSes, the
published limits will be changed to match really...  

Thanks,

-- Gaby
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