add the plugins dir

plugins/Makefile.am

@@ -0,0 +1,17 @@
+plugindir=$(libdir)/openbox/plugins
+
+CPPFLAGS=$(XFT_CFLAGS) $(GLIB_CFLAGS) @CPPFLAGS@ \
+-DPLUGINDIR=\"$(plugindir)\" \
+-DG_LOG_DOMAIN=\"Openbox-Plugin\"
+
+#engine_LTLIBRARIES=openbox.la
+
+#openbox_la_LDFLAGS=-module -avoid-version
+#openbox_la_SOURCES=openbox.c theme.c
+
+noinst_HEADERS=
+
+MAINTAINERCLEANFILES= Makefile.in
+
+distclean-local:
+	$(RM) *\~ *.orig *.rej .\#*