Also build package in indep target (Closes: #987126)

As the -src package moved to arch all,

debian/rules

@@ -36,7 +36,7 @@ update_upstream_signing_key:
 
 override_dh_auto_clean: gencontrol
 	# remove autogenerated files
-	rm -f \
+	rm -f -v \
 		src/cmd/cgo/zdefaultcc.go \
 		src/cmd/go/internal/cfg/zdefaultcc.go \
 		src/cmd/go/internal/cfg/zosarch.go \
@@ -110,7 +110,8 @@ override_dh_shlibdeps:
 override_dh_makeshlibs:
 	dh_makeshlibs -Xtestdata -Xtest
 
-override_dh_auto_build-arch:
+override_dh_auto_build:
+	# run in -indep as well, it is needed for generating files.
 	[ -f VERSION ] || echo "debian snapshot $(DEB_VERSION)" > VERSION
 	export GOROOT_BOOTSTRAP=$$(env -i go env GOROOT) \
 		&& cd src \