auto merge of #14360 : alexcrichton/rust/remove-deprecated, r=kballard
auto merge of #14360 : alexcrichton/rust/remove-deprecated, r=kballard

These have all been deprecated for awhile now, so it's likely time to start removing them.

achanda/rand,waynenilsen/rand,ebfull/rand,retep998/rand,bhickey/rand,GrahamDennis/rand,bluss/rand,shepmaster/rand,huonw/rand,arthurprs/rand