new: add release script

Add a updated version of script for creating the release tarball.
If TAG is set the TAG is used otherwise it is tried to detect the last
TAG using git describe.

scripts/create_release_taball.sh

@@ -0,0 +1,31 @@
+#!/bin/bash -e
+
+if [ -z ${TAG:-} ];then
+	echo "No TAG set - trying to detect"
+	TAG=$(git describe --tags)
+	echo "Is the TAG ${TAG} ok (YES|NO)?"
+	read answ
+	case "$answ" in
+		YES):
+			;;
+		*)
+			echo 'stopping here'
+			exit 1
+	esac
+fi
+
+TMPDIR=$(mktemp -d -t release-${TAG}-XXXXXXXXXX)
+
+git archive ${TAG} --prefix=freerdp-${TAG}/ |gzip -9 > ${TMPDIR}/freerdp-${TAG}.tar.gz
+tar xzvf ${TMPDIR}/freerdp-${TAG}.tar.gz -C ${TMPDIR}
+echo ${TAG} > ${TMPDIR}/freerdp-${TAG}/.source_version
+pushd .
+cd  $TMPDIR
+tar czvf freerdp-${TAG}.tar.gz freerdp-${TAG}
+md5sum freerdp-${TAG}.tar.gz > freerdp-${TAG}.tar.gz.md5
+sha1sum freerdp-${TAG}.tar.gz > freerdp-${TAG}.tar.gz.sha1
+sha256sum freerdp-${TAG}.tar.gz > freerdp-${TAG}.tar.gz.sha256
+popd
+mv ${TMPDIR}/freerdp-${TAG}.tar.gz* .
+rm -rf ${TMPDIR}
+exit 0