packaging: rpms actually build now
GC: Bugfix in visit_short_svalue to avoid fatal.

Fixes a fatal that was triggered if Pike.count_memory or Pike.identify_cycle
was performed on a backend object having either pending call_outs or any
active or inactive fd:s (it seems that's the only call site of
gc_recurse_short_svalue, which in turn is the only call site of
visit_short_svalue).