[MAJOR] new framework for generic ACL support

This framework offers all other subsystems the ability to register
ACL matching criteria. Some generic matching functions are already
provided. Others will come soon and the framework shall evolve.
diff --git a/Makefile b/Makefile
index 12de8be..3f5dfa7 100644
--- a/Makefile
+++ b/Makefile
@@ -217,7 +217,7 @@
        src/time.o src/fd.o src/regex.o src/cfgparse.o src/server.o \
        src/checks.o src/queue.o src/capture.o src/client.o src/proxy.o \
        src/proto_http.o src/stream_sock.o src/appsession.o src/backend.o \
-       src/session.o src/hdr_idx.o src/ev_select.o
+       src/session.o src/hdr_idx.o src/ev_select.o src/acl.o
 
 haproxy: $(OBJS) $(OPT_OBJS)
 	$(LD) $(LDFLAGS) -o $@ $^ $(LIBS)