9718 update mandoc to 1.14.4

*** 1,6 ****
! /*      $Id: mansearch.c,v 1.76 2017/08/02 13:29:04 schwarze Exp $ */
  /*
   * Copyright (c) 2012 Kristaps Dzonsons <kristaps@bsd.lv>
   * Copyright (c) 2013-2017 Ingo Schwarze <schwarze@openbsd.org>
   *
   * Permission to use, copy, modify, and distribute this software for any
--- 1,6 ----
! /*      $Id: mansearch.c,v 1.77 2017/08/22 17:50:11 schwarze Exp $ */
  /*
   * Copyright (c) 2012 Kristaps Dzonsons <kristaps@bsd.lv>
   * Copyright (c) 2013-2017 Ingo Schwarze <schwarze@openbsd.org>
   *
   * Permission to use, copy, modify, and distribute this software for any
*** 186,195 ****
--- 186,205 ----
                                      maxres, sizeof(**res));
                          }
                          mpage = *res + cur;
                          mandoc_asprintf(&mpage->file, "%s/%s",
                              paths->paths[i], page->file + 1);
+                         if (access(chdir_status ? page->file + 1 :
+                             mpage->file, R_OK) == -1) {
+                                 warn("%s", mpage->file);
+                                 warnx("outdated mandoc.db contains "
+                                     "bogus %s entry, run makewhatis %s", 
+                                     page->file + 1, paths->paths[i]);
+                                 free(mpage->file);
+                                 free(rp);
+                                 continue;
+                         }
                          mpage->names = buildnames(page);
                          mpage->output = buildoutput(outkey, page);
                          mpage->ipath = i;
                          mpage->bits = rp->bits;
                          mpage->sec = *page->sect - '0';