Fixes the hulk slip bug creating huge amounts of lag by making hulk unable to slide or slip on space lub. Same bug happened to alien humanoids and all carbons that cannot be weakened and thus could move during the slide. So now, only carbons with CANWEAKEN can slip and slide on lube.
Merge pull request #5491 from phil235/HulkSlipFix

Fixes the hulk slip bug creating huge amounts of lag