change(makefile): removed useless code.

Author: membphis

Makefile

@@ -57,18 +57,6 @@ install:
 	$(INSTALL) $(C_SO_NAME) $(INST_LIBDIR)/
 
 
-### dev:          Create a development ENV
-.PHONY: dev
-dev:
-ifeq ($(UNAME),Darwin)
-	luarocks install --lua-dir=$(LUA_JIT_DIR) rockspec/lua-resty-radixtree-dev-1.0-0.rockspec --only-deps
-else ifneq ($(LUAROCKS_VER),'luarocks 3.')
-	luarocks install rockspec/lua-resty-radixtree-dev-1.0-0.rockspec --only-deps
-else
-	luarocks install --lua-dir=/usr/local/openresty/luajit rockspec/lua-resty-radixtree-dev-1.0-0.rockspec --only-deps
-endif
-
-
 ### help:         Show Makefile rules
 .PHONY: help
 help: