OpenGL2: Store normals/tangents as int16_t[4].

code/renderergl2/tr_animation.c

@@ -412,7 +412,7 @@ void RB_MDRSurfaceAnim( mdrSurface_t *surface )
 		tess.xyz[baseVertex + j][1] = tempVert[1];
 		tess.xyz[baseVertex + j][2] = tempVert[2];
 
-		R_VaoPackNormal((byte *)&tess.normal[baseVertex + j], tempNormal);
+		R_VaoPackNormal(tess.normal[baseVertex + j], tempNormal);
 
 		tess.texCoords[baseVertex + j][0][0] = v->texCoords[0];
 		tess.texCoords[baseVertex + j][0][1] = v->texCoords[1];