Adjust .gitignore to reflect new Debian packaging.

.gitignore

@@ -7,8 +7,15 @@ src/.copts_*
 contrib/lease-tools/dhcp_lease_time
 contrib/lease-tools/dhcp_release
 contrib/lease-tools/dhcp_release6
+debian/.debhelper
+debian/auto-build
+debian/debhelper-build-stamp
 debian/files
-debian/substvars
-debian/utils-substvars
-debian/trees/
-debian/build/
+debian/*.substvars
+debian/*.debhelper
+debian/*.log
+debian/dnsmasq-base-lua/
+debian/dnsmasq-base/
+debian/dnsmasq-utils/
+debian/dnsmasq/
+debian/tmp