Work on weak order (#2979)

* JAUSectionHeap OK

* Slightly improve d_camera weak func order (12 -> 10)

* Minor d_a_alink fixes

* weak_order_diff.py: Change to take source file as cli argument instead of .o file

For cli autocompletion to work.

* Reorganize J3D structs (no change in weak order)

include/d/actor/d_a_alink.h

@@ -213,7 +213,7 @@ class daAlinkHIO_data_c : public JORReflexible {
 public:
 #if DEBUG
     daAlinkHIO_data_c();
-    ~daAlinkHIO_data_c();
+    virtual ~daAlinkHIO_data_c();
 
     void setStructData(char*);
     void checkDataSize();

include/d/d_bg_s_sph_chk.h

@@ -23,7 +23,6 @@ public:
 class dBgS_CamSphChk : public dBgS_SphChk {
 public:
     dBgS_CamSphChk() { SetCam(); }
-    virtual ~dBgS_CamSphChk() {}
 };
 
 #endif /* D_BG_D_BG_S_SPH_CHK_H */