weakld: generate duplicate weak aliases

[bird]

weakld sometimes (wonder if symbol hashing is required) outputs more than one alias for the same weak symbol. This naturally causes some serious screwup in the binary... ilink gives this warning when it sees the duplicate alias: R:\TMP\wk101643e4c0f21cf468.obj(wk0.obj) : warning LNK4080: changing substitute name for alias "snip" from "snip" to "snip".

[bird]

The hashing changes in emxomf broke some silly attempt at keeping track of truncated symbols in weakld (emxomfld). I've removed the silliness and the testcase I've got works ok now, without any warnings.