time: fix Makefile so deps.bash is happy (fixes build)

TBR=r
https://golang.org/cl/183133
diff --git a/src/pkg/time/Makefile b/src/pkg/time/Makefile
index f73fc88..1dbdb22 100644
--- a/src/pkg/time/Makefile
+++ b/src/pkg/time/Makefile
@@ -6,7 +6,7 @@
 
 TARG=time
 GOFILES=\
-	format.go \
+	format.go\
 	sleep.go\
 	tick.go\
 	time.go\