Log Message:
libretro-nxengine: Update to 20200109

Emery Hemingway (6):
      Remove superfluous C++ include
      Tupfile for super-repositories
      Revert "Build rules for Genode platform"
      Support original keyboard mappings
      Optional LIBRETRO_COMM_DIR override
      Stop polling inputs after F3

Leonardo Montenegro (1):
      Adding diacritics support