debian: Group all dpkg-architecture variables together

debian/rules

@@ -17,20 +17,18 @@ dpkg_buildflags = \
 	DEB_CXXFLAGS_MAINT_APPEND="$(WFLAGS)" \
 	$(CURDIR)/run-script perl scripts/dpkg-buildflags.pl
 
-# These are used for cross-compiling and for saving the configure script
-# from having to guess our platform (since we know it already)
-DEB_HOST_GNU_TYPE   ?= $(shell dpkg-architecture -qDEB_HOST_GNU_TYPE)
 DEB_BUILD_GNU_TYPE  ?= $(shell dpkg-architecture -qDEB_BUILD_GNU_TYPE)
+DEB_HOST_GNU_TYPE   ?= $(shell dpkg-architecture -qDEB_HOST_GNU_TYPE)
+DEB_HOST_ARCH_OS    ?= $(shell dpkg-architecture -qDEB_HOST_ARCH_OS)
 
+# Support cross-compiling.
 ifeq ($(DEB_BUILD_GNU_TYPE), $(DEB_HOST_GNU_TYPE))
 	confflags += --build=$(DEB_HOST_GNU_TYPE)
 else
 	confflags += --build=$(DEB_BUILD_GNU_TYPE) --host=$(DEB_HOST_GNU_TYPE)
 endif
 
-# Don't enable everything on all platforms
-DEB_HOST_ARCH_OS  ?= $(shell dpkg-architecture -qDEB_HOST_ARCH_OS)
-
+# Do not enable everything on all platforms.
 ifeq ($(DEB_HOST_ARCH_OS),linux)
 	confflags += --with-selinux
 endif