[Bsp][qemu-vexpress-gemini]fix build error with gcc

[Bsp][nuvoton_nuc472]fix gcc build with gcc

[net][sal] Fix accept create new socket failed issue.

[Bsp][nuvoton_m05x]fix build error with gcc

[Bsp][Apollo2]fix build error with gcc

[lwIP] Fix the wait queue initialization issue.

[components] Remove lwP from v3.1.0

Feature libdl

[bsp][rt1050] Fix the pin driver GCC build warning. | 修复pin驱动gcc编译警告.

 [net][at] Modify 'AT+CLOSE' processing method 

add RT_USED to component init and finsh shell

[Kernel] move module to libc/libdl.

[kernel] add RT_USED to INIT_EXPORT, so that the initialization function is not deleted when it is linked.

Add AT multiple client support

Update portserial_m.c

sorry, miss out other two parts.

Update portserial_m.c

add macro to aviod compile error with:
rt_pin_mode(MODBUS_MASTER_RT_CONTROL_PIN_INDEX, PIN_MODE_OUTPUT);