tests/sh.test uses $SED without setting it

[Derek Price]

While working on some other stuff, I noticed that tests/sh.test is
calling $SED without it being set, though this was only causing a
warning message and the test passed.  I'm not sure this was the best way
to handle it (perhaps configure should look for sed?), but I fixed the
warning by having $SED default to `sed' in the attached patch.

2005-07-07  Derek R. Price  <address@hidden>

    * tests/sh.test (SED): Default variable contents to `sed'.


Cheers,

Derek