implied: tweak timeout in separate_and_filter
I mostly hit this timeout when I'm debugging code and I pipe the output to
less. It was deeply confusing why Smatch behaved differently while I was
debugging compared to in normal runs.
This change does three things:
1) Increase the timeout to 20 seconds
2) Don't actually bail, just mark the one variable as too complicated to
deal with the implications.
3) Add a slightly inaccurate printf() so that it doesn't silently give up.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>