packages - work from commit date rather than authored date

This is used for our package information, although it's not used to check for newer versions
as we only check the remote hash of a git repository for updates.

We also used this for checking if we need to update a binary based on the last date of a change to the
module file. However as we were using author date, if a binary was built before the change was accepted, but
more recently than the change was authored, it wouldn't trigger a binary rebuild.

It makes more sense to use the date the commit was made rather than when it was authored in both cases, as
we want to know when something was last changed in the repository rather than the date of the change.

Author: joolswills

scriptmodules/packages.sh

@@ -643,7 +643,7 @@ function rp_hasNewerModule() {
                 local vendor="${__mod_info[$id/vendor]}"
                 local repo_dir="$scriptdir"
                 [[ "$vendor" != "RetroPie" ]] && repo_dir+="/ext/$vendor"
-                local module_date="$(git -C "$repo_dir" log -1 --format=%aI -- "${__mod_info[$id/path]}")"
+                local module_date="$(git -C "$repo_dir" log -1 --format=%cI -- "${__mod_info[$id/path]}")"
                 if rp_dateIsNewer "$pkg_date" "$module_date"; then
                     ret=0
                 fi
@@ -790,7 +790,7 @@ function rp_setPackageInfo() {
                     local repo_dir="${__mod_info[$id/repo_dir]}"
                     [[ -z "$repo_dir" ]] && repo_dir="$md_build"
                     # date cannot understand the default date format of git
-                    pkg_repo_date="$(git -C "$repo_dir" log -1 --format=%aI)"
+                    pkg_repo_date="$(git -C "$repo_dir" log -1 --format=%cI)"
                     pkg_repo_commit="$(git -C "$repo_dir" log -1 --format=%H)"
                 else
                     pkg_repo_date="$(svn info . | grep -oP "Last Changed Date: \K.*")"