exec: Stricter pathopt parsing

This patch changes the parsing of pathopt.  First of all only
%builtin and %func (with arbitrary suffixes) will be recognised.
Any other pathopt will be treated as a normal directory.

Furthermore, pathopt can now be specified before the directory,
rather than after it.  In fact, a future version may remove support
for pathopt suffixes.

Wherever the pathopt is placed, an optional % may be placed after
it to terminate the pathopt.

This is so that it is less likely that a genuine directory containing
a % sign is parsed as a pathopt.

Users of padvance outside of exec.c have also been modified:

1) cd(1) will always treat % characters as part of the path.
2) chkmail will continue to accept arbitrary pathopt.
3) find_dot_file will ignore the %builtin pathopt instead of trying
to do a stat in the accompanying directory (which is usually the
current directory).

The patch also removes the clearcmdentry optimisation where we
attempt to only partially flush the table where possible.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

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