go/types: run tests that were excluded by mistake

Backport of https://go-review.googlesource.com/#/c/12517/.

TBR=adonovan

Change-Id: I6b010c977c9a770a27c3fa1271c07c38d9b84185
Reviewed-on: https://go-review.googlesource.com/12601
Reviewed-by: Robert Griesemer <[email protected]>

Author: griesemer

go/types/stdlib_test.go

@@ -122,7 +122,7 @@ func TestStdTest(t *testing.T) {
 
 	// test/recover4.go is only built for Linux and Darwin.
 	// TODO(gri) Remove once tests consider +build tags (issue 10370).
-	if runtime.GOOS != "linux" || runtime.GOOS != "darwin" {
+	if runtime.GOOS != "linux" && runtime.GOOS != "darwin" {
 		return
 	}