mkdeb.sh.in: remove unused PACKAGE_TARNAME/TOP vars

PACKAGE_TARNAME was added on commit 87e7b31 ("Configure Debian package
with AA and SELinux options", 2020-05-13) / PR netblue30#3414.

TOP was added on commit ed4a24c ("porting make deb-apparmor from LTS
build", 2019-01-26).

mkdeb.sh.in

@@ -9,7 +9,6 @@
 set -e
 NAME=@PACKAGE_NAME@
 VERSION=@PACKAGE_VERSION@
-PACKAGE_TARNAME=@PACKAGE_TARNAME@
 HAVE_APPARMOR=@HAVE_APPARMOR@
 HAVE_SELINUX=@HAVE_SELINUX@
 EXTRA_VERSION=$1
@@ -22,7 +21,6 @@ if [ -n "$HAVE_SELINUX" ]; then
     CONFIG_ARGS="$CONFIG_ARGS --enable-selinux"
 fi
 
-TOP="$PWD"
 CODE_ARCHIVE="$NAME-$VERSION.tar.xz"
 CODE_DIR="$NAME-$VERSION"
 INSTALL_DIR="${INSTALL_DIR}${CODE_DIR}/debian"