libsdl2: upgrade 2.30.1 -> 2.30.2

libsdl2: upgrade 2.30.1 -> 2.30.2

Changelog:
===========
-Fixed performance regression initializing controllers on Linux
-Added support for the 6-button SEGA Mega Drive Control Pad for Nintendo Online
-Added support for the MadCatz Saitek Side Panel Control Deck
-Added support for the Hori Fighting Stick EX2
-Added support for the Yawman Arrow flightstick
-Added a gamepad mapping for the Defender Joystick Cobra R4
-Fixed the gamepad mapping for the Sanwa Supply JY-P76USV controller
-Poll for the initial controller state when using DirectInput
-Allow using SDL_RWFromFile() with named pipes

Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>