Pick-up libevent2 from LOCALBASE.

Index: etc/netatalk/Makefile.in
--- etc/netatalk/Makefile.in.orig
+++ etc/netatalk/Makefile.in
@@ -439,7 +439,7 @@ netatalk_LDADD = \
 	@ZEROCONF_LIBS@ \
 	$(top_builddir)/libatalk/libatalk.la
 
-netatalk_LDFLAGS = @LIBEVENT_LDFLAGS@ -levent
+netatalk_LDFLAGS = @LIBEVENT_LDFLAGS@ $$(pkg-config --libs libevent)
 noinst_HEADERS = afp_zeroconf.h afp_avahi.h afp_mdns.h
 all: all-am