acl: Fix endless loop on Solaris with vxfs. * lib/file-has-acl.c (file_has_acl) [Solaris]: Treat a failing acl()/facl() call for ACE_GETACL like a failing call for ACE_GETACLCNT. * lib/set-mode-acl.c (qset_acl) [Solaris]: Likewise. * lib/copy-acl.c (qcopy_acl)[Solaris]: Likewise. * tests/test-sameacls.c (main)[Solaris]: Likewise. Reported by Bill Jones in <http://debbugs.gnu.org/cgi/bugreport.cgi?bug=10639>, via Paul Eggert.