Fix tests on MacOS.

This comes down to the lack of a 'seq' command (what?!) and the fact that
BSD "wc -l" returns extra whitespace, while the GNU version doesn't.  We
should be using numeric comparisons instead of string comparisons, and then
it's ok.

t/curse/seq

@@ -0,0 +1,6 @@
+#!/bin/sh
+i=0
+while [ "$i" -lt "$1" ]; do
+	i=$(($i + 1))
+	echo $i
+done