9718 update mandoc to 1.14.4

@@ -1,6 +1,6 @@
-/*      $Id: mansearch.c,v 1.76 2017/08/02 13:29:04 schwarze Exp $ */
+/*      $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

@@ -186,10 +186,20 @@
                                     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+                                warnx("outdated mandoc.db contains "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';