Add make-tarball.sh script

Initially by psychon, then kylef modified it and helped to find it when
it was lost

So let it just lay here in order not to be lost again

make-tarball.sh

@@ -0,0 +1,52 @@
+#!/bin/sh
+set -e
+
+TMPDIR=`mktemp -d`
+VERSION=$1
+
+trap 'rm -rf $TMPDIR' EXIT
+
+if [ ! -f include/znc/main.h ] ; then
+    echo "Can't find source!"
+	exit -1
+fi
+
+if [ "x$VERSION" = "x" ] ; then
+	AWK_ARG='/#define VERSION_MAJOR/ { maj = $3 }
+		/#define VERSION_MINOR/ { min = $3 }
+		END { printf "%.1f", (maj + min / 10) }'
+	VERSION=$(awk "$AWK_ARG" include/znc/main.h)
+fi
+if [ "x$VERSION" = "x" ] ; then
+	echo "Couldn't get version number"
+	exit -1
+fi
+
+ZNC=znc-$VERSION
+TAR=$ZNC.tar
+TARGZ=$TAR.gz
+
+echo "Exporting . to $TMPDIR/$ZNC..."
+git checkout-index --all --prefix=$TMPDIR/$ZNC/
+(
+	cd $TMPDIR/$ZNC
+	echo "Generating configure"
+	AUTOMAKE_FLAGS="--add-missing --copy" ./autogen.sh
+	rm -r autom4te.cache/
+    mkdir -p modules/.depend
+    make -C modules -f modperl/Makefile.gen srcdir=. SWIG=/usr/bin/swig
+    make -C modules -f modpython/Makefile.gen srcdir=. SWIG=/usr/bin/swig
+    rm -fr modules/.depend
+	rm make-tarball.sh
+)
+(
+	cd $TMPDIR
+	echo "Creating tarball"
+	tar -cf $TAR $ZNC
+	gzip -9 $TAR
+)
+echo "Done"
+mv $TMPDIR/$TARGZ .
+echo "Signing $TARGZ..."
+gpg --detach-sig $TARGZ
+echo "Created $TARGZ and $TARGZ.sig"