[cvs] bogofilter/tests/bogofilter t.grftest,1.5,1.6

[David Relson]

Matthias,

"diff -u" is used in two ways.  The first is in the test itself.  Since 
we're providing reference outputs, any flavor of diff is acceptable - so 
long as the output is the same of the original and test machines.  That's 
where the "-u" matters most.  The other use is with the "-v" (verbose) 
switch and is for people who want to see what really went wrong.  I just 
threw in the "if linux" bit as a convenience.  Anybody who really cares 
about the test outputs is likely to tweak the scripts for their personal 
convenience.

We could change my "if linux" test, but it's not really necessary.

David