Is it time to defunct `wc()`?

[GegznaV]

wc related tests (randomly) fail on Windows. E.g.:

Can we defunct wc() function as it was deprecated for quite a long time? What do you think @cbeleites?

For now, unit tests are disabled on Mac and Windows.

Originally posted by @GegznaV in #109 (comment)

[cbeleites]

yes, definitively