Update snapshot to latest. Includes a fix for a memory leak.
Version handling changed to use PKG_SOURCE_DATE and PKG_SOURCE_VERSION
as per OpenWrt package policies [1].
PKG_BUILD_PARALLEL:=1 added.
[1] https://openwrt.org/docs/guide-developer/package-policies
Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>
The source does not change, but reflect the real version (2.2.1) in
PKG_VERSION. Also move from gz to xz to shave off a few Bytes.
Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>