Although motived by Cygwin, this patch will prevent
test_commands from failing on Unixes that support
ACLs. For example, the following is an excerpt from
the Solaris ls manpage:

	...
	-rwxrwxrwx+ 1 smith dev 10876 May 16 9:42 part2

	The plus sign indicates that there is an ACL associated
	with the file.
	...