[BUILD] do not build rbtree anymore
Rbtree is not used anymore. Remove it from the makefiles.
diff --git a/Makefile.osx b/Makefile.osx
index 111587b..4b02871 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/rbtree.o src/ev_select.o src/ev_poll.o
+ src/session.o src/hdr_idx.o src/ev_select.o src/ev_poll.o
all: haproxy