runtime: skip failing gdb test on linux/arm

Updates #10002

The gdb test added in 1c82e236 is failing on most arm systems.

Temporarily disable this test so that we can return to a working arm build.

Change-Id: Iff96ea8d5a99e1ceacf4979e864ff196e5503535
Reviewed-on: https://go-review.googlesource.com/5902Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/runtime/runtime-gdb_test.go

@@ -43,6 +43,10 @@ func TestGdbPython(t *testing.T) {
 		t.Skip("gdb does not work on darwin")
 	}
 
+	if runtime.GOOS == "linux" && runtime.GOARCH == "arm" {
+		t.Skip("issue 10002")
+	}
+
 	checkGdbPython(t)
 
 	dir, err := ioutil.TempDir("", "go-build")