Add missing edge on transluency function

Src/Graphics/New3D/PolyHeader.cpp

@@ -179,6 +179,11 @@ bool PolyHeader::NoLosReturn()
 	return (header[1] & 0x1) > 0;
 }
 
+bool PolyHeader::EdgeOnTranslucency()
+{
+	return (header[1] & 0x80) > 0;
+}
+
 //
 // header 2
 //

Src/Graphics/New3D/PolyHeader.h

@@ -108,6 +108,7 @@ public:
 	bool	FixedShading();
 	bool	SmoothShading();
 	bool	NoLosReturn();			// no line of sight return	(still not exactly how sure this attribute is used yet)
+	bool	EdgeOnTranslucency();
 
 	//header 2
 	bool	TexUMirror();