Streamlining rules file.

Signed-off-by: Daniel Baumann <daniel@debian.org>

debian/rules

@@ -1,31 +1,22 @@
 #!/usr/bin/make -f
 
-PLATFORM :=
-$(call lazy,DEB_HOST_ARCH,$$(shell dpkg-architecture -qDEB_HOST_ARCH))
-ifneq (,$(findstring armhf,$(DEB_HOST_ARCH)))
-	PLATFORM += --platform=armv7l
+include /usr/share/dpkg/architecture.mk
+
+ifeq ($(DEB_BUILD_ARCH),armel)
+	PLATFORM = --platform=armv7l
 endif
 
+%:
+	dh ${@}
+
 override_dh_auto_configure:
-	./configure						\
-		--includedir=/usr/include			\
-		--libdir=/usr/lib/$(DEB_HOST_MULTIARCH)		\
-		--mandir=/usr/share/man				\
-		--prefix=/usr					\
-		--cores=2					\
-		--disable-sse					\
-		$(PLATFORM)
+	dh_auto_configure -- \
+		--prefix=/usr \
+		--libdir=/usr/lib/$(DEB_HOST_MULTIARCH) \
+		--includedir=/usr/include \
+		--mandir=/usr/share/man \
+		--cores=2 \
+		--disable-sse $(PLATFORM)
 
 override_dh_auto_test:
-	make -j1 check
-
-%:
-	dh $@
-
-# The build target must not be empty.  Sadly because of how make
-# works, we have do duplicate the target in this case.
-build:
-	dh $@
-
-.PHONY: build
-
+	$(MAKE) -j1 check