[FIX] Packaging: Debian: ignore root Makefile

Commit 388732df introduced a makefile at the root of the project, and
dh_auto_build is using this file instead of setup.py. Explicitely tell
debhelper to not use the makefile.

debian/rules

@@ -2,4 +2,4 @@
 # vim:noet:
 
 %:
-	dh  ${@}
\ No newline at end of file
+	dh ${@} -Spython_distutils
\ No newline at end of file