* more changes to expect.scm, to avoid the one-character lookhead

* more changes to expect.scm, to avoid the one-character lookhead
that was introduced to fix the $ problem:
* expect.scm (expect): call the match proc an extra time at end
of file and set the eof? argument appropriately.  call
expect-eof-proc only if the last call didn't match.
* expect.scm (expect-strings): change port to eof? in match proc.
* expect.scm (expect-regexec): take an eof indicator as an argument
instead of a port.