Remove automatically installed packages when installing helpers.

This was causing a bug where "grub-common"--a dependency of grub--was remaining
in the binary build chroot after the grub tool was removed. This then resulted
in it not being included in the d-i debs in lh_binary_debian-installer.

Signed-off-by: Chris Lamb <chris@chris-lamb.co.uk>

functions/packages.sh

@@ -51,6 +51,11 @@ Remove_package ()
 		case "${LH_APT}" in
 			apt|apt-get)
 				Chroot "apt-get remove --purge --yes ${PACKAGES}"
+
+				if [ "${LH_DISTRIBUTION}" != "etch" ]
+				then
+					Chroot "apt-get autoremove --purge --yes"
+				fi
 				;;
 
 			aptitude)