retroarch: add core info files to configuration

Core info files are needed starting from 1.10.1 in order to enable save/load state, rewind, runahead, (disk control ?).
In addition to that, they're needed for netplay clients to work (see issue RetroPie#3161).

scriptmodules/emulators/retroarch.sh

@@ -105,6 +105,14 @@ function update_assets_retroarch() {
     chown -R $user:$user "$dir"
 }
 
+function update_core_info_retroarch() {
+    local dir="$configdir/all/retroarch/cores"
+    # remove if not a git repository and do a fresh checkout
+    [[ ! -d "$dir/.git" ]] && rm -fr "$dir"
+    gitPullOrClone "$configdir/all/retroarch/cores" https://github.com/libretro/libretro-core-info.git
+    chown -R $user:$user "$dir"
+}
+
 function install_minimal_assets_retroarch() {
     local dir="$configdir/all/retroarch/assets"
     [[ -d "$dir/.git" ]] && return
@@ -143,6 +151,9 @@ function configure_retroarch() {
     # install minimal assets
     install_minimal_assets_retroarch
 
+    # install core info files
+    update_core_info_retroarch
+
     # install joypad autoconfig presets
     update_joypad_autoconfigs_retroarch