git: bump version to 2.1.3

- Bump version to 2.1.3
- Add a hash file

Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
git: install git-shell to /etc/shells
git: add user and group for git-shell user
git: pass target_configure_opts to make configure
rpi-firmware: install all firmwares and add option for gpumem
rpi-firmware: use custom repo and bump version
emulationstation: new package
retroarch: new package
skeleton: add a default /etc/shells
board/ryco: add postscript.sh
board/ryco/configs: add raspberry pi project configs
board/ryco: add overlay directory for emulationstation
board/ryco: update raspberry pi patchset and config
board/ryco/configs: update kernel to 3.12.31
system: create network interfaces file
system: fix remount option for modified rcs file
board/ryco/configs/rpi_server.config: add network configuration
board/ryco/configs: update configs
rpi-userland: bump version

remove musl patch since it is now upstream
remove patch for faulty assert
rpi-userland: add additional pkg-config libs