deb cleanup

* use installed pg_buildext
* use installed pgxs_debian_control.mk
* don't override 'clean' target in debian/rules
* 'make deb' forces control file regeneration

This reduces crap maintained locally.

It also does mean that to build against server-dev-X.Y package
that is not for Debians default Postgres version, following packages
need to be installed from PGDG (wiki.postgresql.org/wiki/Apt) repo:

  postgresql-client-common
  postgresql-common
  postgresql-server-dev-all

Makefile

@@ -146,6 +146,8 @@ ack:
 	cp results/*.out test/expected/
 
 deb:
+	rm -f debian/control
+	make -f debian/rules debian/control
 	debuild -uc -us -b
 
 debclean:

debian/rules

@@ -6,19 +6,11 @@
 DEB_BUILD_OPTIONS := nostrip nocheck
 export DEB_BUILD_OPTIONS
 
-PG_BUILDEXT = ./debian/pg_buildext
+PG_BUILDEXT = pg_buildext
 
-debian/control-stamp: debian/control.in debian/pgversions debian/rules
-	grep-dctrl -vP PGVERSION debian/control.in > debian/control
-	for v in $$($(PG_BUILDEXT) supported-versions . ); \
-        do                                         \
-		grep -q "^$$v" debian/pgversions   \
-		&& grep-dctrl -P PGVERSION debian/control.in \
-		| sed -e "s:PGVERSION:$$v:" >> debian/control; \
-	done
-	touch $@
+include /usr/share/postgresql-common/pgxs_debian_control.mk
 
-clean: debian/control-stamp
+override_dh_auto_clean:
 	for v in $$($(PG_BUILDEXT) supported-versions . ) ; do \
 		rm -rf debian/postgresql-plproxy-$${v}; \
 	done
@@ -34,13 +26,10 @@ override_dh_auto_install:
 		|| exit 1 ; \
 	done
 
-build binary override_dh_auto_build: debian/control-stamp
-
-build binary binary-arch binary-indep:
+%:
 	dh $@
 
-.PHONY: build  binary binary-arch binary-indep clean
-.PHONY: orig override_dh_auto_install override_dh_auto_clean override_dh_auto_build
+.PHONY: orig realclean
 
 PKGVERS     = $(shell dpkg-parsechangelog | awk -F '[:-]' '/^Version:/ { print substr($$2, 2) }')
 srcpkg = plproxy2_$(PKGVERS)