[RFA:] fix 27_io/basic_ostream/inserters_arithmetic/char/4402.cc

[Paolo Carlini]

Paolo Carlini wrote:

>    int exp = std::numeric_limits<long double>::max_exponent10 - 2;
>    long double val = std::pow(1.2345678901234567890123456789L, exp);

or just:

    long double val = std::numeric_limits<long double>::max();

and be done with it?

Paolo.