[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.osx b/Makefile.osx
index 4b02871..3666a88 100644
--- a/Makefile.osx
+++ b/Makefile.osx
@@ -87,7 +87,7 @@
        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/ev_poll.o
+       src/session.o src/hdr_idx.o src/ev_select.o src/ev_poll.o src/acl.o
 
 all: haproxy