Set ERL_LIBS to $(DEPS_DIR) rather than `deps`
Set ERL_LIBS to $(DEPS_DIR) rather than `deps`

This solves a recursion problem when compiling deeper recursive
makefile structures. All dependencies are pulled to the top-level
dependencies directory by virtue of DEPS_DIR, but the recursive make
calls to erlc fails since the value is hard-coded.

a12n/erlang.mk,KrzysiekJ/erlang.mk,yannayl/erlang.mk,bsmr-erlang/erlang.mk,hairyhum/erlang.mk,layerhq/erlang.mk,efcasado/erlang.mk,dch/erlang.mk,ingwinlu/erlang.mk,rabbitmq/erlang.mk,crownedgrouse/erlang.mk,jj1bdx/erlang.mk,nevar/erlang.mk,michaelnisi/erlang.mk,ninenines/erlang.mk