Log Message:
libretro-ppsspp: add version 1.6.3.

Libretro is a simple but powerful development interface that allows for
the easy creation of emulators, games and multimedia applications that
can plug straight into any libretro-compatible frontend. This development
interface is open to others so that they can run these pluggable emulator
and game cores also in their own programs or devices.

PPSSPP is a PlayStation Portable (PSP) video game system emulator that
can be used as a libretro core.