runtime: move TestNeedmDeadlock to crash_cgo_test.go

It requires cgo. Also, skip the test on windows and plan9.

For #42207

Change-Id: I8522773f93bc3f9826506a41a08b86a083262e31
Reviewed-on: https://go-review.googlesource.com/c/go/+/265778
Trust: Ian Lance Taylor <[email protected]>
Run-TryBot: Ian Lance Taylor <[email protected]>
Reviewed-by: Brad Fitzpatrick <[email protected]>

Author: ianlancetaylor

src/runtime/crash_cgo_test.go

@@ -600,3 +600,16 @@ func TestEINTR(t *testing.T) {
 		t.Fatalf("want %s, got %s\n", want, output)
 	}
 }
+
+// Issue #42207.
+func TestNeedmDeadlock(t *testing.T) {
+	switch runtime.GOOS {
+	case "plan9", "windows":
+		t.Skipf("no signals on %s", runtime.GOOS)
+	}
+	output := runTestProg(t, "testprogcgo", "NeedmDeadlock")
+	want := "OK\n"
+	if output != want {
+		t.Fatalf("want %s, got %s\n", want, output)
+	}
+}

src/runtime/crash_unix_test.go

@@ -358,12 +358,3 @@ func TestSignalM(t *testing.T) {
 		t.Fatalf("signal sent to M %d, but received on M %d", want, got)
 	}
 }
-
-// Issue #42207.
-func TestNeedmDeadlock(t *testing.T) {
-	output := runTestProg(t, "testprogcgo", "NeedmDeadlock")
-	want := "OK\n"
-	if output != want {
-		t.Fatalf("want %s, got %s\n", want, output)
-	}
-}