Fix some more GCC warnings, mark some bugs based on GCC warnings (#2309)

* Fix some more GCC warnings, mark some bugs based on GCC warnings

* Weird formatting

* Suggested changes

* More weird indentation I guess

* UNREACHABLE() macro, add missing NORETURNs to fault_n64.c

* AVOID_UB for PAL path in z_file_nameset.c

* Remove comments about return types

* Remove temp no longer needed

src/code/db_camera.c

@@ -1,5 +1,7 @@
 #include "global.h"
 
+#if DEBUG_FEATURES
+
 #define DEBUG_CAM_CONTROLLER_PORT 2
 
 static PlayState* sPlay;
@@ -2366,3 +2368,5 @@ void func_800BB060(void) {
 int func_800BB06C(void) {
     return sDebugCamPtr->unk_00 == 2 && sDebugCamAnim.unk_0A != 0;
 }
+
+#endif