Rework CoreTiming

src/tests/core/core_timing.cpp

@@ -9,6 +9,7 @@
 #include <cstdlib>
 #include <memory>
 #include <mutex>
+#include <optional>
 #include <string>
 
 #include "core/core.h"
@@ -25,13 +26,15 @@ u64 expected_callback = 0;
 std::mutex control_mutex;
 
 template <unsigned int IDX>
-void HostCallbackTemplate(std::uintptr_t user_data, std::chrono::nanoseconds ns_late) {
+std::optional<std::chrono::nanoseconds> HostCallbackTemplate(std::uintptr_t user_data, s64 time,
+                                                             std::chrono::nanoseconds ns_late) {
     std::unique_lock<std::mutex> lk(control_mutex);
     static_assert(IDX < CB_IDS.size(), "IDX out of range");
     callbacks_ran_flags.set(IDX);
     REQUIRE(CB_IDS[IDX] == user_data);
     delays[IDX] = ns_late.count();
     ++expected_callback;
+    return std::nullopt;
 }
 
 struct ScopeInit final {