Add wip snapshot to track oldabi git branch

designed with help from nucleo

ffmpeg-snapshot-oldabi.sh

@@ -0,0 +1,21 @@
+#!/bin/bash
+
+set -e
+
+tmp=$(mktemp -d)
+
+trap cleanup EXIT
+cleanup() {
+    set +e
+    [ -z "$tmp" -o ! -d "$tmp" ] || rm -rf "$tmp"
+}
+
+unset CDPATH
+pwd=$(pwd)
+date=$(date +%Y%m%d)
+
+pushd "$tmp"
+git clone git://git.videolan.org/ffmpeg.git -b oldabi
+cd ffmpeg
+git archive --prefix="ffmpeg-oldabi-${date}/" --format=tar oldabi | bzip2 > "$pwd"/ffmpeg-oldabi-${date}.tar.bz2
+popd