feeds: use git-src-full to allow Git versioning
Both $(AUTORELEASE) and $(PKG_SRC_VERSION) (from luci.git) use the Git log to determine releases and package timestamps.
Feeds are shallow cloned by default, resulting in an incomplete Git log and therefore different local package versions than offered upstream.
This commits sets the default feeds to use src-git-full
to solve that.
Taken from upstream: https://github.com/openwrt/openwrt/commit/7fae1e5677e9bb4979c8d4ac99be4de6955b13d0
Fixes: packages!942 (merged)
Edited by Josef Schlehofer