Improvement in handling of the custom bridging angle value.

In case the bridge is only supported at one side, it is technically
not considered to be a support, therefore the default infill angle is used.
With this change, the bridging areas use the custom angle value even
if not supported on both sides.

src/libslic3r/Rasterizer/Rasterizer.hpp

@@ -6,7 +6,7 @@
 #include <vector>
 #include <cstdint>
 
-namespace ClipperLib { class Polygon; }
+namespace ClipperLib { struct Polygon; }
 
 namespace Slic3r {