Re-write t_agetstr() so that it does not use realloc so userland
programs don't break. We now use an internal buffer to keep track
of the memory we allocate. This changes the api of t_agetstr() to
take 2 fewer arguments, but there are not many programs that use it.
Please note that this does not change binary compatibility with the
previous t_agetstr() since the usage was:
char *area, *p;
*area = NULL;
t_agetstr(ti, "ic", &area, &p);
...
free(area);
Since we don't touch the arguments and free(NULL) is a no-op, nothing
breaks.
Since we don't break binary compatibility there is no reason to bump
the library's major number, but since we change t_agetstr() I'll bump
the minor number for good measure.
these capabilities and stashes them in "struct tinfo" for t_goto to
use. This makes the t_goto call more efficient and plugs a memory
leak that was present in the original t_goto implementation.
Thanks to Itojun for spotting this one too!
