re-add realpath to prefer-external-if-argument, needed by Debian

funcs.c

@@ -38,7 +38,7 @@
 #endif
 #endif
 
-__RCSID("$MirOS: src/bin/mksh/funcs.c,v 1.298 2016/07/24 23:10:02 tg Exp $");
+__RCSID("$MirOS: src/bin/mksh/funcs.c,v 1.299 2016/07/24 23:11:50 tg Exp $");
 
 #if HAVE_KILLPG
 /*
@@ -124,7 +124,7 @@ const struct builtin mkshbuiltins[] = {
 	{"pwd", c_pwd},
 	{"read", c_read},
 	{Tsgreadonly, c_typeset},
-	{"realpath", c_realpath},
+	{"!realpath", c_realpath},
 	{"rename", c_rename},
 	{"*=return", c_exitreturn},
 	{Tsgset, c_set},

mksh.1

@@ -1,4 +1,4 @@
-.\" $MirOS: src/bin/mksh/mksh.1,v 1.400 2016/07/24 23:05:52 tg Exp $
+.\" $MirOS: src/bin/mksh/mksh.1,v 1.401 2016/07/24 23:11:51 tg Exp $
 .\" $OpenBSD: ksh.1,v 1.160 2015/07/04 13:27:04 feinerer Exp $
 .\"-
 .\" Copyright © 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
@@ -3977,6 +3977,9 @@ it's also checked for existence and whether it is a directory; otherwise,
 .Ic realpath
 returns 0 if the pathname either exists or can be created immediately,
 i.e. all but the last component exist and are directories.
+For calls from the shell, if any options are given, an external
+.Xr realpath 1
+utility is preferred over the builtin.
 .Pp
 .It Xo
 .Ic rename