Add missing implementation of sass_importer_get_list_entry.
Add missing implementation of sass_importer_get_list_entry.

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