exim_dbmbuild PATCH

Simple little patch so exim_dbmbuild can be used in a pipe (which is
how I use it).

*** exim_dbmbuild.c    1996/03/20 13:24:02    1.1
--- exim_dbmbuild.c    1996/03/20 13:27:52
***************
*** 52,58 ****
    exit(1);  
    }

! f = fopen(argv[1], "r");
  if (f == NULL)
    {
    printf("exim_dbmbuild: unable to open %s: %s\n", argv[1], strerror(errno));
--- 52,61 ----
    exit(1);  
    }

! if (strcmp (argv[1], "-") == 0)
!   f = fdopen (0, "r");
! else
!   f = fopen(argv[1], "r");
  if (f == NULL)
    {
    printf("exim_dbmbuild: unable to open %s: %s\n", argv[1], strerror(errno));