Fix bug where chmod, chown, and chgrp did not process operands

Fix bug where chmod, chown, and chgrp did not process operands
left-to-right in some cases.
* src/chmod.c (wd_errno): New var.
(chmod_file): New function, with most of the contents of the
old prcess_file function.
(process_files): Use it.  This gives file names to fts one
at a time, so that they are processed left-to-right as POSIX
requires.
* src/chown-core.c (wd_errno, chown_files): Likewise.
(chown_file): New function.
* tests/install/basic-1: Redo test so as to not workaround
the chmod bug, thereby testing for it.