Fix GCC warnings to be ready for GCC standalone build

third_party/agg23/agg_path_storage.h

 
 //----------------------------------------------------------------------------
 // Anti-Grain Geometry - Version 2.3
 // Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
 //
 // Permission to copy, use, modify, sell and distribute this software
 // is granted provided this copyright notice appears in all copies.
 // This software is provided "as is" without express or implied
 // warranty, and with no claim as to its suitability for any purpose.
 //
@@ skipping 20 matching lines @@
     {
     public:
         vertex_source() {}
         vertex_source(const path_storage& p) : m_path(&p), m_vertex_idx(0) {}
         void rewind(unsigned path_id)
         {
             m_vertex_idx = path_id;
         }
         unsigned vertex(FX_FLOAT* x, FX_FLOAT* y)
         {
-            return (m_vertex_idx < m_path->total_vertices()) ?
-                   m_path->vertex(m_vertex_idx++, x, y) :
-                   path_cmd_stop;
+          return (m_vertex_idx < m_path->total_vertices())
+                     ? m_path->vertex(m_vertex_idx++, x, y)
+                     : static_cast<unsigned>(path_cmd_stop);
         }
     private:
         const path_storage* m_path;
         unsigned            m_vertex_idx;
     };
     ~path_storage();
     path_storage();
     unsigned last_vertex(FX_FLOAT* x, FX_FLOAT* y) const;
     unsigned prev_vertex(FX_FLOAT* x, FX_FLOAT* y) const;
     void move_to(FX_FLOAT x, FX_FLOAT y);
@@ skipping 109 matching lines @@
 inline void path_storage::move_to(FX_FLOAT x, FX_FLOAT y)
 {
     add_vertex(x, y, path_cmd_move_to);
 }
 inline void path_storage::line_to(FX_FLOAT x, FX_FLOAT y)
 {
     add_vertex(x, y, path_cmd_line_to);
 }
 }
 #endif