added makefile for easy installation

git-svn-id: http://projects.xennet.org/archtools/devtools/trunk@140 630f3fb4-fbd1-0310-a574-b293cca3120f

Makefile

+all:
+
+install:
+	mkdir -p $(DESTDIR)/usr/bin
+	install -m 755 checkpkg $(DESTDIR)/usr/bin
+	install -m 755 extrapkg $(DESTDIR)/usr/bin
+	ln -s extrapkg $(DESTDIR)/usr/bin/currentpkg
+	ln -s extrapkg $(DESTDIR)/usr/bin/testingpkg
+	ln -s extrapkg $(DESTDIR)/usr/bin/unstablepkg