Add a precompiled header for RELs (#2597)

src/d/d_spline_path.cpp

@@ -3,6 +3,8 @@
  * dolzel2 - Spline Path Management
  */
 
+#include "d/dolzel.h"
+
 #include "d/d_spline_path.h"
 #include "d/d_path.h"
 #include "d/d_stage.h"
@@ -147,4 +149,4 @@ cXyz dPathCurve::bSpline2(f32 param_0) {
         local_7c.z = point11->z * fVar7 + point10->z * fVar6 + point8->z * fVar5;
         return local_7c;
     }
-}
+}