cc3200: Remove socket.timeout class, use OSError(ETIMEDOUT) instead.

socket.timeout is a subclass of OSError, and using the latter is more
efficient than having a dedicated class.  The argument of OSError is
ETIMEDOUT so the error can be distinguished from other kinds of
OSErrors.  This follows how the esp8266 port does it.

cc3200/mods/modusocket.c

@@ -520,7 +520,7 @@ STATIC mp_obj_t socket_recv(mp_obj_t self_in, mp_obj_t len_in) {
     mp_int_t ret = wlan_socket_recv(self, (byte*)vstr.buf, len, &_errno);
     if (ret < 0) {
         if (_errno == MP_EAGAIN && self->sock_base.has_timeout) {
-            mp_raise_msg(&mp_type_TimeoutError, "timed out");
+            mp_raise_OSError(MP_ETIMEDOUT);
         }
         mp_raise_OSError(-_errno);
     }
@@ -566,7 +566,7 @@ STATIC mp_obj_t socket_recvfrom(mp_obj_t self_in, mp_obj_t len_in) {
     mp_int_t ret = wlan_socket_recvfrom(self, (byte*)vstr.buf, vstr.len, ip, &port, &_errno);
     if (ret < 0) {
         if (_errno == MP_EAGAIN && self->sock_base.has_timeout) {
-            mp_raise_msg(&mp_type_TimeoutError, "timed out");
+            mp_raise_OSError(MP_ETIMEDOUT);
         }
         mp_raise_OSError(-_errno);
     }
@@ -763,9 +763,6 @@ STATIC const mp_map_elem_t mp_module_usocket_globals_table[] = {
     { MP_OBJ_NEW_QSTR(MP_QSTR_socket),          (mp_obj_t)&socket_type },
     { MP_OBJ_NEW_QSTR(MP_QSTR_getaddrinfo),     (mp_obj_t)&mod_usocket_getaddrinfo_obj },
 
-    // class exceptions
-    { MP_OBJ_NEW_QSTR(MP_QSTR_timeout),         (mp_obj_t)&mp_type_TimeoutError },
-
     // class constants
     { MP_OBJ_NEW_QSTR(MP_QSTR_AF_INET),         MP_OBJ_NEW_SMALL_INT(SL_AF_INET) },
 

cc3200/mpconfigport.h

@@ -79,7 +79,6 @@
 #define MICROPY_VFS                                 (1)
 #define MICROPY_VFS_FAT                             (1)
 #define MICROPY_PY_ASYNC_AWAIT (0)
-#define MICROPY_PY_BUILTINS_TIMEOUTERROR            (1)
 #define MICROPY_PY_ALL_SPECIAL_METHODS              (1)
 #define MICROPY_PY_BUILTINS_HELP                    (1)
 #define MICROPY_PY_BUILTINS_HELP_TEXT               cc3200_help_text