Only build .o files listed in the spec (#2410)

* Only build .o files listed in the spec

* Remove useless CPP guards

src/code/db_camera.c

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