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/Makefile

@@ -1,13 +1,13 @@
 all:
 	. ./check-1.sh
 	$(MAKE) 1.n0 2.n0 3.n0
-	$(MAKE) $(shell seq 10 | sed 's/$$/.n1/')
+	$(MAKE) $(shell ./seq 10 | sed 's/$$/.n1/')
 	. ./check-2.sh
 
-%.n0: $(shell seq 10 | sed 's/$$/.n1/')
+%.n0: $(shell ./seq 10 | sed 's/$$/.n1/')
 	: >$@
 
-%.n1: $(shell seq 100 | sed 's/$$/.n2/')
+%.n1: $(shell ./seq 100 | sed 's/$$/.n2/')
 	echo n1-$* >$@
 
 .PRECIOUS: %.n2

t/curse/check-2.sh

@@ -1,12 +1,12 @@
 COUNT_IN=$(ls *.count | wc -l)
 COUNT_OUT=$(cat *.count | wc -l)
-if [ "$COUNT_IN" != "$COUNT_OUT" ]; then
+if [ "$COUNT_IN" -ne "$COUNT_OUT" ]; then
 	echo "expected $COUNT_IN individual writes, got $COUNT_OUT" >&2
 	exit 42
 fi
 COUNTALL_IN=$(cat in.countall | wc -l)
 COUNTALL_OUT=$(cat out.countall | wc -l)
-if [ "$COUNTALL_IN" != "$COUNTALL_OUT" ]; then
+if [ "$COUNTALL_IN" -ne "$COUNTALL_OUT" ]; then
 	echo "expected $COUNTALL_IN allwrites, got $COUNTALL_OUT" >&2
 	exit 43
 fi

t/curse/default.n0.do

@@ -1,2 +1,2 @@
-DEPS=$(seq 10 | sed 's/$/.n1/')
+DEPS=$(./seq 10 | sed 's/$/.n1/')
 redo-ifchange $DEPS

t/curse/default.n1.do

@@ -1,3 +1,3 @@
-DEPS=$(seq 100 | sed 's/$/.n2/')
+DEPS=$(./seq 100 | sed 's/$/.n2/')
 redo-ifchange $DEPS
 echo n1-$1

t/curse/seq

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

t/curse/test.do

@@ -1,6 +1,6 @@
 . ./check-1.sh
 redo-ifchange 1.n0 2.n0 3.n0
-DEPS=$(seq 10 | sed 's/$/.n1/')
+DEPS=$(./seq 10 | sed 's/$/.n1/')
 redo-ifchange $DEPS
 . ../skip-if-minimal-do.sh
 . ./check-2.sh