Added Mesh:setWireframe and Mesh:isWireframe.

This should *only* be used for debugging: the wireframe lines behave differently from regular love.graphics lines, and the functionality may not work on OpenGL ES.

src/modules/graphics/opengl/wrap_Mesh.h

@@ -47,6 +47,8 @@ int w_Mesh_setDrawMode(lua_State *L);
 int w_Mesh_getDrawMode(lua_State *L);
 int w_Mesh_setVertexColors(lua_State *L);
 int w_Mesh_hasVertexColors(lua_State *L);
+int w_Mesh_setWireframe(lua_State *L);
+int w_Mesh_isWireframe(lua_State *L);
 
 extern "C" int luaopen_mesh(lua_State *L);