[uClibc] sscanf %as support

[Pete Flugstad]

Just to confirm, it looks lke sscanf in uClibc doesn't support the glibc 
'a' modifier:

    a      (glibc) Indicates that the conversion will be s, the
           needed memory space for the string will be malloc'ed
           and the pointer to it will be assigned to the char
           pointer variable, which does not have to be initialized
           before.  This flag does not exist in ANSI C (C89) and
           has a different meaning in C99.

It appears to simply bail (stop converting) when it encounters this 
format string, correct?

Thanks,
Pete