pkg/strings: Remove fmt.Println

Remove `fmt.Println` from `strings.MinRunes`

Closes #105
https://github.com/cuelang/cue/pull/105

GitOrigin-RevId: 5d249feabd4f4c3920ad2f6b96fbe6636ac2db82
Change-Id: If20bf31dce393528f2118c79311930b3ca3e64cc
Reviewed-on: https://cue-review.googlesource.com/c/cue/+/3140
Reviewed-by: Marcel van Lohuizen <mpvl@golang.org>
diff --git a/cue/builtins.go b/cue/builtins.go
index bdb686b..2e6ef2a 100644
--- a/cue/builtins.go
+++ b/cue/builtins.go
@@ -2027,8 +2027,6 @@
 			Func: func(c *callCtxt) {
 				s, min := c.string(0), c.int(1)
 				c.ret = func() interface{} {
-
-					fmt.Println(len([]rune(s)))
 					return len([]rune(s)) >= min
 				}()
 			},