Use composition instead of inheritance for fganon

include/d/actor/d_a_fganon.h

@@ -14,8 +14,9 @@ class mDoExt_McaMorf;
 class mDoExt_brkAnm;
 class mDoExt_btkAnm;
 
-class fganon_class : public fopEn_enemy_c {
+class fganon_class {
 public:
+    /* 0x000 */ fopEn_enemy_c actor;
     /* 0x2AC */ request_of_phase_process_class mPhs1;
     /* 0x2B4 */ request_of_phase_process_class mPhs2;
     /* 0x2BC */ u8 m2BC;

src/d/actor/d_a_fgmahou.cpp

@@ -129,7 +129,7 @@ static void move(fgmahou_class* i_this) {
                 break;
             }
 
-            i_this->mTargetPos = fganon2->eyePos;
+            i_this->mTargetPos = fganon2->actor.eyePos;
             i_this->mTargetPos.y -= cM_rndFX(50.0f) + 50.0f;
             i_this->home.angle.y -= 0x8000;
             i_this->home.angle.x *= -1;