Don't depend on wxWidgets dotted and dashed line styles.

Turns out they're buggy on OSX.

Fixes https://gitlab.com/kicad/code/kicad/issues/7144

include/plotter.h

@@ -112,16 +112,6 @@ enum class PLOT_DASH_TYPE
     LAST_TYPE = DASHDOT
 };
 
-/**
- * Convert KiCad line plot styles to wxWidgets device context styles.
- *
- * @param aType The KiCad line plot style to convert.
- *
- * @return The equivalent wxPenStyle of \a aType.
- */
-wxPenStyle GetwxPenStyle( PLOT_DASH_TYPE aType );
-
-
 /**
  * Base plotter engine class. General rule: all the interface with the caller
  * is done in IU, the IU size is specified with SetViewport. Internal and