Add needed functions to glibc-compat for pkg

ports/glibc-compat/src/herror.c

 /*
  * Copyright (c) 1987, 1993
  *    The Regents of the University of California.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 66 matching lines @@
                 v++;
                 v->iov_base = ": ";
                 v->iov_len = 2;
                 v++;
         }
         v->iov_base = (char *)hstrerror(h_errno);
         v->iov_len = strlen(v->iov_base);
         v++;
         v->iov_base = "\n";
         v->iov_len = 1;
-#ifndef writev
-#define writev(fd, iov, iovcnt) \
-        do { \
-                int i; \
-                for (i = 0; i < (iovcnt); ++i) { \
-                        write((fd), (iov)[i].iov_base, (iov)[i].iov_len); \
-                } \
-        } while (0)
-#endif
         writev(STDERR_FILENO, iov, (v - iov) + 1);
 }
 
 /*
  * hstrerror --
  *      return the string associated with a given "host" errno value.
  */
 const char *
 hstrerror(int err) {
         if (err < 0)
                 return ("Resolver internal error");
         else if (err < h_nerr)
                 return (h_errlist[err]);
         return ("Unknown resolver error");
 }