[OpenSIPS-Devel] [OpenSIPS/opensips] fbd54c: Always overwrite DEFS variable but provide an init

[Razvan Crainea]

  Branch: refs/heads/master
  Home:   https://github.com/OpenSIPS/opensips
  Commit: fbd54c4a599299da93fc54626766ad34d1afa97a
      https://github.com/OpenSIPS/opensips/commit/fbd54c4a599299da93fc54626766ad34d1afa97a
  Author: Razvan Crainea <razvan at opensips.org>
  Date:   2017-04-14 (Fri, 14 Apr 2017)

  Changed paths:
    M Makefile

  Log Message:
  -----------
  Always overwrite DEFS variable but provide an init

This is a better solution to 5324464234 for providing DEFS from outside
the building environment