Compilation problems under macOS

[Tomasz Gebarowski]

src/server/jardin_server_obj.c:774:41: error: implicit conversion from enumeration type 'jardin_status_t' to different enumeration type
      'jardin_connection_status_t' [-Werror,-Wenum-conversion]
    jardin_connection_status_t status = JARDIN_EINVAL;
                               ~~~~~~ ^~~~~~~~~~~~~
src/server/jardin_server_obj.c:780:18: error: implicit conversion from enumeration type 'jardin_status_t' to different enumeration type
      'jardin_connection_status_t' [-Werror,-Wenum-conversion]
        status = JARDIN_OK;
               ~ ^~~~~~~~~
src/server/jardin_server_obj.c:782:12: error: implicit conversion from enumeration type 'jardin_connection_status_t' to different
      enumeration type 'jardin_status_t' [-Werror,-Wenum-conversion]
    return status;
    ~~~~~~ ^~~~~~

src/server/jardin_server.c:161:12: error: implicit conversion from enumeration type 'jardin_status_t' to different enumeration type
      'jardin_connection_status_t' [-Werror,-Wenum-conversion]
    return JARDIN_EINVAL;
    ~~~~~~ ^~~~~~~~~~~~~