d/rules: cleanup file

No need to use variables.
Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>

debian/rules

@@ -5,17 +5,9 @@ export V=1
 DEB_HOST_MULTIARCH ?= $(shell dpkg-architecture -qDEB_HOST_MULTIARCH)
 LIB_DIR := /usr/lib/$(DEB_HOST_MULTIARCH)
 
-_dhopts := --with autoreconf
-
-_configure := \
-  --disable-libipq \
-  --enable-devel \
-  --libdir=$(LIB_DIR) \
-  --with-xtlibdir=$(LIB_DIR)/xtables
-
-
 %:
-	dh $@ $(_dhopts)
+	dh $@ --with autoreconf
 
 override_dh_auto_configure:
-	dh_auto_configure -- $(_configure)
+	dh_auto_configure -- --disable-libipq --enable-devel \
+			--libdir=$(LIB_DIR) --with-xtlibdir=$(LIB_DIR)/xtables