exec-with-log.sh.in: set WOCKY_DEBUG.
exec-with-log.sh.in: set WOCKY_DEBUG.

I'm delighted that 3a1fe026 made us compatible with hypothetical shells,
but it also reduced the amount of debug output in gabble-testing.log.

Ziemin/telepathy-gabble,Ziemin/telepathy-gabble,Ziemin/telepathy-gabble,mlundblad/telepathy-gabble,Ziemin/telepathy-gabble,mlundblad/telepathy-gabble,mlundblad/telepathy-gabble