runtime: remove makeStringSlice

Change-Id: I38d716de9d5a9c1b868641262067d0456d52c86d
Reviewed-on: https://go-review.googlesource.com/6612Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/runtime/os1_windows.go

@@ -220,7 +220,7 @@ func goenvs() {
 			n++
 		}
 	}
-	envs = makeStringSlice(n)
+	envs = make([]string, n)
 
 	for i := range envs {
 		envs[i] = gostringw(&p[0])

src/runtime/runtime.go

@@ -43,10 +43,6 @@ func tickspersecond() int64 {
 	return r
 }
 
-func makeStringSlice(n int) []string {
-	return make([]string, n)
-}
-
 var envs []string
 var argslice []string