old/regexp, old/template, template: use rune

Nothing terribly interesting here.

R=r, gri
CC=golang-dev
https://golang.org/cl/5308042
diff --git a/src/pkg/template/exec_test.go b/src/pkg/template/exec_test.go
index 50b0ad2..6c19f11 100644
--- a/src/pkg/template/exec_test.go
+++ b/src/pkg/template/exec_test.go
@@ -644,7 +644,7 @@
 	if err != nil {
 		t.Fatal("exec error:", err)
 	}
-	stripSpace := func(r int) int {
+	stripSpace := func(r rune) rune {
 		if r == '\t' || r == '\n' {
 			return -1
 		}