[dmd-internals] [D-Programming-Language/dmd] 686d5a: add -dconf switch from merging in D2 code

[GitHub via dmd-internals]

  Branch: refs/heads/dmd-1.x
  Home:   https://github.com/D-Programming-Language/dmd
  Commit: 686d5a0262e34d336bcc8864fdd31bde9e4bb233
      https://github.com/D-Programming-Language/dmd/commit/686d5a0262e34d336bcc8864fdd31bde9e4bb233
  Author: Walter Bright <walter at walterbright.com>
  Date:   2015-05-14 (Thu, 14 May 2015)

  Changed paths:
    M src/inifile.c
    M src/link.c
    M src/mars.c
    M src/mars.h
    M src/root/root.c
    M src/root/root.h
    M src/utf.h

  Log Message:
  -----------
  add -dconf switch from merging in D2 code