Various m410dll fixes

Match first translation unit and much of game.c

include/ext_math.h

@@ -13,6 +13,7 @@ typedef struct vec2f {
 
 #define VECDistanceXZ(a, b) sqrtf((((a)->x-(b)->x)*((a)->x-(b)->x))+(((a)->z-(b)->z)*((a)->z-(b)->z)))
 #define VECDistanceZY(a, b) sqrtf((((a)->z-(b)->z)*((a)->z-(b)->z))+(((a)->y-(b)->y)*((a)->y-(b)->y)))
+#define VECSumXZ(a, b) sqrtf((((a)->x+(b)->x)*((a)->x+(b)->x))+(((a)->z+(b)->z)*((a)->z+(b)->z)))
 
 #define VECMagXZ(a) sqrtf(((a)->x*(a)->x)+((a)->z*(a)->z))
 #define VECMagPoint(x, y, z) sqrtf(((x)*(x))+((y)*(y))+((z)*(z)))

include/game/hsfman.h

@@ -64,7 +64,7 @@ typedef struct model_data {
     Vec rot;
     Vec scale;
     Mtx unk_F0;
-    ParticleData *unk_120;
+    void *unk_120;
 } ModelData; // sizeof 0x124
 typedef struct camera_data {
     f32 fov;