fix build on OpenBSD (#621)

* fix build on OpenBSD

* Update src/port/Game.cpp

* Update ceremony_and_credits.c

src/ending/ceremony_and_credits.c

@@ -998,7 +998,7 @@ void func_80284154(CinematicCamera* camera) {
 void func_80284184(CinematicCamera* camera) {
     f32 trophy;
 
-    if (gTrophyIndex != NULL) {
+    if (gTrophyIndex != NULL_OBJECT_ID) {
         trophy = ((gObjectList[gTrophyIndex].pos[1] - camera->lookAt[1]) * 0.9f) + camera->lookAt[1];
         f32_lerp(&camera->pos[1], trophy, 0.5);
     }

src/port/Game.cpp

@@ -70,7 +70,7 @@ HarbourMastersIntro gMenuIntro;
 
 TrackEditor::Editor gEditor;
 
-s32 gTrophyIndex = NULL;
+s32 gTrophyIndex = NULL_OBJECT_ID;
 
 /** Spawner Registries **/
 Registry<TrackInfo> gTrackRegistry;

src/port/Game.h

@@ -239,6 +239,7 @@ __attribute__((format(printf, 1, 2)))
 #if defined(_MSC_VER)
     __declspec(noreturn) 
 #elif defined(__APPLE__)
+#elif defined(__OpenBSD__)
 #elif defined(__cplusplus) || (__STDC_VERSION__ >= 202311)
     [[noreturn]] 
 #elif defined(__GNUC__)