make it build in a multiarch cross build environment

TODO: check if docs still build on regular builds

debian/control

@@ -7,7 +7,7 @@ Homepage: https://guh.io
 Vcs-Git: https://github.com/guh/guh.git
 Build-Depends: debhelper (>= 9.0.0),
                dpkg-dev (>= 1.16.1~),
-               python,
+               python:any,
                rsync,
                qtchooser,
                qt5-default,

debian/rules

@@ -22,13 +22,7 @@ $(PREPROCESS_FILES:.in=): %: %.in
 
 
 override_dh_auto_build:
-	make
-	make doc
-
-
-override_dh_auto_test:
-	make test
-
+	make -j$(DEB_PARALLEL_JOBS)
 
 override_dh_install: $(PREPROCESS_FILES:.in=)
 	dh_install --fail-missing