this is a maintenance update for platforms not yet ported to 4.x branch
- update RetroArch to 1.10.1
- update cores on par with Lakka 4.0 in branch Lakka-v4.x
- bump Lakka version to 3.7.1
- add PKG_SKIP_SUBMODULE variable (pcsx_rearmed has obsolete submodule
registration, which breaks cloning the repo and pulling submodules)
- bump cmake to 3.15.0 (required by play)
* libretro: Update RetroArch to 1.9.14 + cores to latest
* flycast: Change to the upstream flycast package
This change makes use of the upstream flycast repository, rather than the libretro fork.
* flycast: Remove GLES from PKG_CMAKE_OPS_TARGET
* lakka: Update to version 3.7
