cmd/pack: skip fork test on darwin/arm

Change-Id: I65b50d2501fe822bc9044a851ac0b3467feadd9f
Reviewed-on: https://go-review.googlesource.com/6330Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/cmd/pack/pack_test.go

@@ -202,6 +202,10 @@ func TestHello(t *testing.T) {
 	switch runtime.GOOS {
 	case "android", "nacl":
 		t.Skipf("skipping on %s", runtime.GOOS)
+	case "darwin":
+		if runtime.GOARCH == "arm" {
+			t.Skipf("skipping on %s/%s", runtime.GOOS, runtime.GOARCH)
+		}
 	}
 
 	dir := tmpDir(t)
@@ -239,6 +243,10 @@ func TestLargeDefs(t *testing.T) {
 	switch runtime.GOOS {
 	case "android", "nacl":
 		t.Skipf("skipping on %s", runtime.GOOS)
+	case "darwin":
+		if runtime.GOARCH == "arm" {
+			t.Skipf("skipping on %s/%s", runtime.GOOS, runtime.GOARCH)
+		}
 	}
 
 	dir := tmpDir(t)