chmod: bugfix and new tests.

* sysif.c (chmod_wrap): When processing set (=), only punch a
hole in the target permission area once per clause, so as not
to clobber previously set modes. We do this by checking for
the chm_perm state. Whenever '=' is processed, the state machine
enters into that state; when any permission letter is then
processed, it transitions out of that state. This gets the
"u=rwsx" test to pass.

* tests/018/chmod.tl: New tests.

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