Dropped support for autotools build

It's just too much of a pain to maintain.

make_release_tarball.sh

@@ -0,0 +1,24 @@
+#!/bin/sh
+#
+# Create tarball from Git tag, removing and adding
+# some files.
+#
+
+set -e
+
+if [ -z "$1" ]; then
+    TAG="$(git tag --list 'sshfs-3*' --sort=-taggerdate | head -1)"
+else
+    TAG="$1"
+fi
+
+echo "Creating release tarball for ${TAG}..."
+
+mkdir "${TAG}"
+git archive --format=tar "${TAG}" | tar -x "--directory=${TAG}"
+find "${TAG}" -name .gitignore -delete
+rm "${TAG}/make_release_tarball.sh" \
+   "${TAG}/.travis.yml" \
+   "${TAG}/test/travis-*.sh"
+tar -cJf "${TAG}.tar.xz" "${TAG}/"
+gpg --armor --detach-sign "${TAG}.tar.xz"