debian/{watch,bin/uscan-hook}: Drop uscan hook in favour of uupdate

uscan now does the file removals, which makes the hook script
redundant.  Not only that, but the orig tarball passed to the hook is
no longer a symlink to the upstream filename, so genorig.py doesn't
recognise the filename and fails.

debian/bin/uscan-hook

@@ -1,19 +0,0 @@
-#!/bin/bash -e
-
-# This script is invoked by uscan after downloading a new tarball
-
-if [ "x$1" != "x--upstream-version" -o $# != 3 ]; then
-   echo >&2 "invalid arguments: $*"
-   exit 2
-fi
-
-version="$2"
-filename="$3"
-
-upstream_tarball="$(readlink -f "$filename")"
-rm "$filename"
-debian/bin/genorig.py --override-version "$version" "$upstream_tarball"
-
-dch -v "$version-1" 'New upstream release'
-
-debian/rules orig

debian/changelog

@@ -6,6 +6,7 @@ linux (4.18.6-2) UNRELEASED; urgency=medium
   * [rt] genpatch-rt: Store patches and series file in debian/patches-rt
   * linux-headers: Stop linking the doc directory, which is not binNMU-safe
   * debian/copyright: Simplify exclusions to work with mk-origtargz
+  * debian/{watch,bin/uscan-hook}: Drop uscan hook in favour of uupdate
 
   [ Salvatore Bonaccorso ]
   * mac80211: don't update the PM state of a peer upon a multicast frame

debian/watch

@@ -1,4 +1,3 @@
 # Find first non-rc tarball linked from kernel.org.
-# We need to DFSG-clean it, so use our own script instead of uupdate.
 version=3
-https://www.kernel.org/ .*/linux-([0-9.]+).tar.xz debian debian/bin/uscan-hook
+https://www.kernel.org/ .*/linux-([0-9.]+).tar.xz debian uupdate