Temporarily disable the api.alturl test because the feature now requires a...

Temporarily disable the api.alturl test because the feature now requires a read-only dataset and OpenZGY doesn't make those yet.

native/src/test/test_api.cpp

@@ -2823,7 +2823,8 @@ public:
 #ifdef HAVE_SD
     register_sd_test("api.write_cloud",         test_write_cloud);
     register_sd_test("api.write_cloud_mt",      test_write_cloud_mt);
-    register_sd_test("api.alturl",              test_alturl);
+    // FAILS: Need to make the dataset read-only.
+    //register_sd_test("api.alturl",              test_alturl);
 #endif
     register_test("api.historange",          test_historange);
     register_test("api.lod_lowpass",         test_lod_lowpass);