copydir() and rmtree() need to use lstat, not stat, to behave as expected

with symlinks.  Noted while trying to use rmtree in new C-code pg_regress.

Author: tglsfdc

src/port/copydir.c

@@ -11,7 +11,7 @@
  *	as a service.
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/port/copydir.c,v 1.17 2006/03/05 15:59:10 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/port/copydir.c,v 1.18 2006/07/18 22:36:46 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -75,7 +75,7 @@ copydir(char *fromdir, char *todir, bool recurse)
 		snprintf(fromfile, MAXPGPATH, "%s/%s", fromdir, xlde->d_name);
 		snprintf(tofile, MAXPGPATH, "%s/%s", todir, xlde->d_name);
 
-		if (stat(fromfile, &fst) < 0)
+		if (lstat(fromfile, &fst) < 0)
 			ereport(ERROR,
 					(errcode_for_file_access(),
 					 errmsg("could not stat file \"%s\": %m", fromfile)));

src/port/dirmod.c

@@ -10,7 +10,7 @@
  *	Win32 (NT, Win2k, XP).	replace() doesn't work on Win95/98/Me.
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/port/dirmod.c,v 1.42 2006/03/05 15:59:10 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/port/dirmod.c,v 1.43 2006/07/18 22:36:46 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -434,7 +434,7 @@ rmtree(char *path, bool rmtopdir)
 	{
 		snprintf(filepath, MAXPGPATH, "%s/%s", path, *filename);
 
-		if (stat(filepath, &statbuf) != 0)
+		if (lstat(filepath, &statbuf) != 0)
 			goto report_and_fail;
 
 		if (S_ISDIR(statbuf.st_mode))