Use COMPAT_MODE to fix inline function not defined warnings on modern compilers (#1315)

* Use `COMPAT_MODE` to fix inline function not defined

* Fix

LEGO1/realtime/matrix.h

@@ -52,4 +52,8 @@ public:
 	const float* operator[](int idx) const { return m_data[idx]; }
 };
 
+#ifdef COMPAT_MODE
+#include "matrix4d.inl.h"
+#endif
+
 #endif // MATRIX_H

LEGO1/realtime/vector.h

@@ -148,4 +148,10 @@ public:
 	friend class Mx4DPointFloat;
 };
 
+#ifdef COMPAT_MODE
+#include "vector2d.inl.h"
+#include "vector3d.inl.h"
+#include "vector4d.inl.h"
+#endif
+
 #endif // VECTOR_H

LEGO1/realtime/vector4d.inl.h

@@ -3,6 +3,9 @@
 
 #include "vector.h"
 
+#include <math.h>
+#include <memory.h>
+
 // FUNCTION: LEGO1 0x10002870
 void Vector4::AddImpl(const float* p_value)
 {