coreutils:
- Don't remove variables such as $PATH and $SHELL from the calling
environment (from upstream).
- When su is invoked with command line arguments for the shell
(e.g. "su - -c 'cmd'"), set argv[0] in the shell to "-su" or
"-<basename>" (as determined by the SU_NAME option in
/etc/login.defs). This is necessary to make Bash compiled with
the NON_INTERACTIVE_LOGIN_SHELLS option to read startup files.
- Don't set $PATH to /bin:/usr/bin but inherit the $PATH of the
caller.
svn path=/nixpkgs/trunk/; revision=22140
