Minimze debian/rules + switch to debhelper-compat approach

debian/control

@@ -2,7 +2,7 @@ Source: grml-live-grml
 Section: grml
 Priority: extra
 Maintainer: Michael Prokop <mika@grml.org>
-Build-Depends: debhelper (>= 7)
+Build-Depends: debhelper-compat (= 12),
 Standards-Version: 3.9.8
 Homepage: https://grml.org/grml-live/
 Vcs-git: git://git.grml.org/grml-live-grml.git

debian/rules

@@ -1,55 +1,8 @@
 #!/usr/bin/make -f
 # -*- makefile -*-
-# Sample debian/rules that uses debhelper.
-# This file was originally written by Joey Hess and Craig Small.
-# As a special exception, when this file is copied by dh-make into a
-# dh-make output file, you may use that output file without restriction.
-# This special exception was added by Craig Small in version 0.37 of dh-make.
 
 # Uncomment this to turn on verbose mode.
 #export DH_VERBOSE=1
 
-build: build-arch build-indep
-
-build-arch: build-stamp
-
-build-indep: build-stamp
-
-build-stamp:
-	dh_testdir
-	touch $@
-
-clean:
-	dh_testdir
-	dh_testroot
-	rm -f build-stamp
-
-	dh_clean
-	# clean up the stuff dh_clean leaves behind
-	-rm -rf debian/build
-
-install: build
-	dh_testdir
-	dh_testroot
-	dh_prep
-	dh_installdirs
-
-# Build architecture-independent files here.
-binary-indep: build install
-	dh_testdir
-	dh_testroot
-	dh_install
-	dh_installchangelogs
-	dh_installdocs
-	dh_link
-	dh_strip
-	dh_compress
-	dh_fixperms
-	dh_installdeb
-	dh_shlibdeps
-	dh_gencontrol
-	dh_md5sums
-	dh_builddeb
-
-binary: binary-indep binary-arch
-.PHONY: build clean binary-indep binary-arch binary install
+%:
+	dh $@