Re: tests/substref.test is not executable

[Tom Tromey]

Tim> Hmm - but your grep for 'ing dir' will fail if NLS is in effect.
Tim> Maybe defs should clean LANG/LANGUAGE/whatever?

Let's just require GNU make for this test.
I'll check this in shortly.

Tim> Note that some people (e.g. me) do not have that choice as there is
Tim> no executable bit on some systems (DJGPP in this case).

I've made a note to remind myself to hack the automake commit scripts
to enforce `chmod +x' on the tests.  I don't know exactly when I can
get to this though.

Tom