Define Auto-Built-Package field when running dpkg-gencontrol

dpkg-source doesn't like to see it in debian/control.

debian/changelog

@@ -15,6 +15,8 @@ linux (4.7~rc7-1~exp1) UNRELEASED; urgency=medium
   * [x86] KASLR, power: Remove x86 hibernation restrictions
   * fanotify: Enable FANOTIFY_ACCESS_PERMISSIONS (Closes: #690737)
     - Warn and taint kernel if this feature is actually used
+  * Define Auto-Built-Package field when running dpkg-gencontrol, as dpkg-source
+    doesn't like to see it in debian/control
 
   [ Bastian Blank ]
   * Mark debug symbols packages to move them into the debug archive.

debian/rules.real

@@ -458,7 +458,7 @@ endif
 	ln -s boot/vmlinux-$(REAL_VERSION) $(DEBUG_DIR)/
 	mkdir -p $(DEBUG_DIR)/lib/modules/$(REAL_VERSION)
 	ln -s ../../../boot/vmlinux-$(REAL_VERSION) $(DEBUG_DIR)/lib/modules/$(REAL_VERSION)/vmlinux
-	+$(MAKE_SELF) install-base
+	+$(MAKE_SELF) install-base GENCONTROL_ARGS='-DAuto-Built-Package=debug-symbols'
 
 install-udeb_$(ARCH): export KW_DEFCONFIG_DIR=debian/installer
 install-udeb_$(ARCH): export KW_CONFIG_DIR=debian/installer/$(ARCH)

debian/templates/control.image-dbg.in

@@ -3,7 +3,6 @@ Build-Profiles: <!stage1>
 Depends: ${misc:Depends}
 Section: debug
 Priority: extra
-Auto-Built-Package: debug-symbols
 Description: Debugging symbols for Linux @abiname@@localversion@
  This package provides the detached debugging symbols for the Linux kernel
  and modules in linux-image-@abiname@@localversion@.