[release-branch.go1.17] cmd/objdump: skip TestDisasm* on darwin-arm64

The macOS 12 builders have an incompatible version of XCode installed.
We fixed the bug on 1.18 but not 1.17.

Updates #49700.

Change-Id: Id356786aad351568ba6665430f093f5f78bb4357
Reviewed-on: https://go-review.googlesource.com/c/go/+/405474
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
diff --git a/src/cmd/objdump/objdump_test.go b/src/cmd/objdump/objdump_test.go
index f231a7c..1ce21c46 100644
--- a/src/cmd/objdump/objdump_test.go
+++ b/src/cmd/objdump/objdump_test.go
@@ -106,6 +106,9 @@
 }
 
 func mustHaveDisasm(t *testing.T) {
+	if strings.HasPrefix(testenv.Builder(), "darwin-arm64") {
+		t.Skipf("builder %q has an incompatible version of XCode installed, see go.dev/issue/49700", testenv.Builder())
+	}
 	switch runtime.GOARCH {
 	case "mips", "mipsle", "mips64", "mips64le":
 		t.Skipf("skipping on %s, issue 12559", runtime.GOARCH)