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

[Paolo Carlini]

Andreas Tobler wrote:

>> Hm, on a first view it seems darwin likes it :)
>
> And solaris9 32 & 64 bit too. 

Thanks Andreas: therefore, now we know what was going on...

Benjamin, do you like the way I propose to fix the problem (i.e, adding 
pubsetbuf( , 8192))??

Alternately, the tests themselves should be changed more drastically.

Paolo.