Split t7508 out

I think this is another space-hungry test, which is causing the overall
test runs to fail.  Try a test where that has been separated out.

Don't test for how much disk space is available before running the space
hungry tests -- we can just let them fail if they're going to fail --
but do report how much disk space is available to stdout so if there is
still a problem it's a bit more obvious.

Author: me-and

git.cygport

@@ -179,7 +179,7 @@ src_test() {
 
 	# Skip tests that need lots of disk space during the main run; we can
 	# run them later when there's more space available.
-	space_hungry_tests=(t7900)
+	space_hungry_tests=(t7508 t7900)
 
 	# Temporarily redefine make to have a timeout when it gets called by
 	# cygmake, after checking that make *is* currently a file executable