Add workaround for buggy gcc warning

We've seen this in a few other places in the codebase, so let's use
the usual workaround.

ext/datadog_profiling_native_extension/collectors_thread_context.c

@@ -1408,9 +1408,10 @@ void thread_context_collector_sample_skipped_allocation_samples(VALUE self_insta
   TypedData_Get_Struct(self_instance, struct thread_context_collector_state, &thread_context_collector_typed_data, state);
 
   ddog_prof_Label labels[] = {
-    {.key = DDOG_CHARSLICE_C("thread id"),        .str = DDOG_CHARSLICE_C("SA")},
-    {.key = DDOG_CHARSLICE_C("thread name"),      .str = DDOG_CHARSLICE_C("Skipped Samples")},
-    {.key = DDOG_CHARSLICE_C("allocation class"), .str = DDOG_CHARSLICE_C("(Skipped Samples)")},
+    // Providing .num = 0 should not be needed but the tracer-2.7 docker image ships a buggy gcc that complains about this
+    {.key = DDOG_CHARSLICE_C("thread id"),        .str = DDOG_CHARSLICE_C("SA"),                .num = 0},
+    {.key = DDOG_CHARSLICE_C("thread name"),      .str = DDOG_CHARSLICE_C("Skipped Samples"),   .num = 0},
+    {.key = DDOG_CHARSLICE_C("allocation class"), .str = DDOG_CHARSLICE_C("(Skipped Samples)"), .num = 0},
   };
   ddog_prof_Slice_Label slice_labels = {.ptr = labels, .len = sizeof(labels) / sizeof(labels[0])};