debian: add lintian

and fix/improve cross building. build now with PIE and RELRO

debian/rules

@@ -6,6 +6,11 @@ export GOPATH=$(shell pwd)/.go
 export DEB_BUILD_OPTIONS=crossbuildcanrunhostbinaries
 
 export GOARCH := $(shell if [ $(DEB_TARGET_ARCH) = "i386" ]; then echo "386"; elif [ $(DEB_TARGET_ARCH) = "armhf" ]; then echo "arm"; else echo  $(DEB_TARGET_ARCH); fi)
+export CGO_ENABLED=1
+
+ifneq ($(DEB_HOST_GNU_TYPE), $(DEB_BUILD_GNU_TYPE))
+	export CC=$(DEB_HOST_GNU_TYPE)-gcc
+endif
 
 %:
 	dh $@ --buildsystem=golang --with=golang,bash-completion
@@ -30,6 +35,13 @@ override_dh_golang: # fails on non native debian build
 override_dh_dwz:  # somehow dwz works only with certain newer debhelper versions
 	dhver=`dpkg-query -f '$${Version}' -W debhelper`; (dpkg --compare-versions "$$dhver" lt 13 || test "$$dhver" = "13.3.4" || test "$$dhver" = "13.6ubuntu1") || dh_dwz
 
+override_dh_shlibdeps:
+ifneq ($(DEB_HOST_GNU_TYPE), $(DEB_BUILD_GNU_TYPE))
+	LD_LIBRARY_PATH=/usr/$(DEB_HOST_GNU_TYPE)/lib:$$LD_LIBRARY_PATH dh_shlibdeps
+else
+	dh_shlibdeps
+endif
+
 override_dh_auto_build:
 	echo $(DEB_VERSION) > VERSION
-	go build -o usr/bin/aptly
+	go build -buildmode=pie -o usr/bin/aptly