file-has-acl: use acl_extended_file_nofollow if available * lib/acl-internal.h (HAVE_ACL_EXTENDED_FILE): New macro. (acl_extended_file): New macro. * lib/file-has-acl.c (file_has_acl): Use acl_extended_file_nofollow. * m4/acl.m4 (gl_FUNC_ACL): Check for acl_extended_file_nofollow. This addresses http://bugzilla.redhat.com/692823.