Put back in the hoistable check since it fixes a handful of diffs in our sass.
Put back in the hoistable check since it fixes a handful of diffs in our sass.

saper/libsass,errorx666/libsass,dahlia/libsass-python,webdev1001/libsass,webdev1001/libsass,mikebarkas/libsass,mikebarkas/libsass,am11/libsass,mtwebster/mint-libsass,errorx666/libsass,mtwebster/mint-libsass,technoAri/libsass,khchanel/libsass,mtwebster/mint-libsass,errorx666/libsass,TBAPI-0KA/NSass,webdev1001/libsass,khchanel/libsass,am11/libsass,am11/libsass,technoAri/libsass,panicinc/libsass,FishingCactus/libsass,webdev1001/libsass,saper/libsass,am11/libsass,TBAPI-0KA/NSass,mtwebster/mint-libsass,webdev1001/libsass,mtwebster/mint-libsass,admire93/libsass-python,TBAPI-0KA/NSass,am11/libsass,errorx666/libsass,panicinc/libsass,FishingCactus/libsass,khchanel/libsass,mikebarkas/libsass,admire93/libsass-python,FishingCactus/libsass,technoAri/libsass,technoAri/libsass,TBAPI-0KA/NSass,saper/libsass,TBAPI-0KA/NSass,saper/libsass,panicinc/libsass,FishingCactus/libsass,panicinc/libsass,FishingCactus/libsass,technoAri/libsass,saper/libsass,dahlia/libsass-python,khchanel/libsass,TBAPI-0KA/NSass,khchanel/libsass,panicinc/libsass,mikebarkas/libsass,mikebarkas/libsass