test -x should use faccessat, not stat

[Eric Blake <ebb9@xxxxxxx>]

This report was originally raised on the cygwin list:

http://cygwin.com/ml/cygwin/2010-02/msg00239.html

In short, in the presence of ACLs, dash's implementation of test -r, test -w, 
and test -x gives incorrect answers, when the current user has permissions to 
access a file that were granted by ACLs but not by the current stat() 
permissions.  dash should be using faccessat(,AT_EACCESS) (or 
eaccess/euidaccess) if available, rather than stat(), to determine whether a 
file is accessible.

-- 
Eric Blake


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