cmd/go: remove a redundant HasExec check in TestScript/README

The test checks testenv.HasExec right before calling testenv.Command,
but testenv.Command already skips the test if HasExec is false.

Change-Id: I04716bf823a1b76640394a964973ff34c65afb1f
Reviewed-on: https://go-review.googlesource.com/c/go/+/491658
Run-TryBot: Bryan Mills <[email protected]>
Auto-Submit: Bryan Mills <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>
Reviewed-by: Michael Matloob <[email protected]>

Author: Bryan C. Mills

src/cmd/go/scriptreadme_test.go

@@ -37,10 +37,6 @@ func checkScriptReadme(t *testing.T, engine *script.Engine, env []string) {
 	}
 	args.Conditions = conds.String()
 
-	if !testenv.HasExec() {
-		t.Skipf("updating script README requires os/exec")
-	}
-
 	doc := new(strings.Builder)
 	cmd := testenv.Command(t, testGo, "doc", "cmd/go/internal/script")
 	cmd.Env = env