ftp: remove libcurl dependency

This splits out sftp into a separate binary that *does* depend on
libcurl. However, ftp now uses the same socket code as gopher.

ftps is dropped, because I've never even tested it. Maybe I'll add
it back when we have working OpenSSL bindings.

This is still "doing the easy part first", now I have no clue how to
handle sftp because my initial plan ("just use the sftp binary") doesn't
work - sftp batch mode doesn't accept passwords. libssh2 remains the
sole candidate, but that's what libcurl wraps anyway.

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