Unify the function interface, avoid lto-type-mismatch

src/frontend/wdisp/winprint.c

@@ -378,7 +378,7 @@ int WPRINT_DrawLine(int x1, int y1, int x2, int y2, bool isgrid)
 }
 
 
-int WPRINT_Arc(int x0, int y0, int radius, double theta, double delta_theta)
+int WPRINT_Arc(int x0, int y0, int radius, double theta, double delta_theta, bool isgrid)
      /*
       * Notes:
       *    Draws an arc of <radius> and center at (x0,y0) beginning at
@@ -397,6 +397,8 @@ int WPRINT_Arc(int x0, int y0, int radius, double theta, double delta_theta)
     double  dx0;
     double  dy0;
 
+    NG_IGNORE(isgrid);
+
     if (!currentgraph) return 0;
     pd = pPrintData(currentgraph);
     if (!pd) return 0;

src/frontend/wdisp/winprint.h

@@ -12,7 +12,7 @@ int WPRINT_NewViewport( GRAPH * graph);
 int WPRINT_Close(void);
 int WPRINT_Clear(void);
 int WPRINT_DrawLine(int x1, int y1, int x2, int y2, bool isgrid);
-int WPRINT_Arc(int x0, int y0, int radius, double theta, double delta_theta);
+int WPRINT_Arc(int x0, int y0, int radius, double theta, double delta_theta, bool isgrid);
 int WPRINT_Text( char * text, int x, int y, int degrees);
 int WPRINT_DefineColor(int colorid, double red, double green, double blue);
 int WPRINT_DefineLinestyle(int num, int mask);