snes9x2010 is already in the rpi3 :
| libretro-snes9x | odroidc2 odroidxu4 rpi3 x86 x86_64 | 024027625c4520785a10be09e593118a0af50112 - Apr 1, 2017 | 2cc408c206eabd3283315af96deee6e21937d0fc - Jan 5, 2017 |
I've added these 3, but i don't except a lot from jaguar and saturn. just test and tell me please.
+BR2_PACKAGE_LIBRETRO_VIRTUALJAGUAR=y
+BR2_PACKAGE_LIBRETRO_MAME2010=y
+BR2_PACKAGE_LIBRETRO_YABAUSE=y