match: remove bad restriction from @(sme) and @(end).

The end pattern in @(sme) and @(end) does not have to be a
list pattern, dotted or otherwise. It should support any
pattern whatsoever for a single object, which should match the
terminating atom. The documentation says that, though not very
clearly; it is reworded also.

* stdlib/match.tl (check-end): Remove this function, since
the end pattern can be any pattern.
(pat-len): Bugfix: we are using the meq function incorrectly.
The object being compared against several alternatives
must be the leftmost argument of meq. This bug prevents a
pattern like @(evenp @x) to be correctly considered of
length zero.
(sme, end): Remove calls to check-end, and just refer to
original end variable.

* tests/011/patmatch.tl: New tests.

* txr.1: clarify that the end pattern may be any pattern,
which can match just the terminating atom or a possibly
dotted suffix.

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