0071-proc/readproc.c: Harden supgrps_from_supgids().

0071-proc/readproc.c: Harden supgrps_from_supgids().

1/ Prevent an integer overflow of t.

2/ Avoid an infinite loop if s contains characters other than comma,
spaces, +, -, and digits.

3/ Handle all possible return values of snprintf().

---------------------------- adapted for newlib branch
. we can't use xrealloc(), so we use realloc() instead
. and must account for a mem failure via a return of 1

Signed-off-by: Jim Warner <james.warner@comcast.net>