windows impl doesn't care if drawPolyLine LineWidth y != x

so I don't see that it makes much of a difference then
if the quartz or cairo one's don't either

Change-Id: Iabd65d617437aa747b910fcd2e84421413ed7db6

vcl/headless/svpgdi.cxx

@@ -690,13 +690,6 @@ bool SvpSalGraphics::drawPolyLine(
         return true;
     }
 
-    // reject requests that cannot be handled yet
-    if (rLineWidths.getX() != rLineWidths.getY())
-    {
-        SAL_WARN("vcl.gdi", "unsupported SvpSalGraphics::drawPolyLine case");
-        return false;
-    }
-
     // #i104886# linejoin-mode and thus the above only applies to "fat" lines
     bool bNoJoin = (basegfx::B2DLineJoin::NONE == eLineJoin && rLineWidths.getX() > 1.3);
 

vcl/quartz/salgdicommon.cxx

@@ -973,13 +973,6 @@ bool AquaSalGraphics::drawPolyLine( const basegfx::B2DPolygon& rPolyLine,
         return true;
     }
 
-    // reject requests that cannot be handled yet
-    if( rLineWidths.getX() != rLineWidths.getY() )
-    {
-        DBG_DRAW_OPERATION_EXIT_EARLY("drawPolyLine");
-        return false;
-    }
-
 #ifdef IOS
     if( !CheckContext() )
     {