Update for release, add simple make_release.sh script

ir/common/version.h

 #define libfirm_VERSION_MAJOR 1
+#define libfirm_VERSION_MINOR 22
 #define libfirm_VERSION_MICRO 0
-#define libfirm_VERSION_MINOR 21

support/make_release.sh

+#!/bin/sh
+
+set -eu
+
+WORKDIR="release"
+VERSION_MAJOR="1"
+VERSION_MINOR="22"
+VERSION_MICRO="0"
+VERSION="${VERSION_MAJOR}.${VERSION_MINOR}.${VERSION_MICRO}"
+RELEASEDIR="libfirm-$VERSION"
+FULLRELEASEDIR="$WORKDIR/$RELEASEDIR"
+RELEASEFILE="libfirm-$VERSION.tar.bz2"
+VERSIONFILE="../ir/common/version.h"
+
+# test if versions match
+echo "Checking for version mismatch"
+egrep -q "#define libfirm_VERSION_MAJOR\\s*$VERSION_MAJOR" $VERSIONFILE
+egrep -q "#define libfirm_VERSION_MINOR\\s*$VERSION_MINOR" $VERSIONFILE
+egrep -q "#define libfirm_VERSION_MICRO\\s*$VERSION_MICRO" $VERSIONFILE
+
+rm -rf "$FULLRELEASEDIR"
+echo "Creating $RELEASEFILE"
+git archive HEAD | bzip2 > "$RELEASEFILE"