[RFTesters] Make portable sgetn/1-in and 1-io tests

[Andreas Tobler]

Andreas Tobler wrote:

> Paolo Carlini wrote:
> 
>> Hi everyone,
>>
>> perhaps I have nailed down the reason underlying the
>> failure on *many* platforms of 27_io/basic_filebuf/sgetn/char/1-in.cc
>> and 1-io.cc: seems due to the value of BUFSIZ not being
>> 8192 everywhere.
>>
>> If my hypothesis is correct the below should fix it.
>>
>> Many thanks in advance,
> 
> 
> 
> Hm, on a first view it seems darwin likes it :)
> 
> PASS: 27_io/basic_filebuf/sgetn/char/1-in.cc (test for excess errors)
> PASS: 27_io/basic_filebuf/sgetn/char/1-in.cc execution test
> 
> PASS: 27_io/basic_filebuf/sgetn/char/1-io.cc (test for excess errors)
> PASS: 27_io/basic_filebuf/sgetn/char/1-io.cc execution test

And solaris9 32 & 64 bit too.

Andreas