acl-permissions, file-has-acl: Remove support for OSF/1. * m4/acl.m4 (gl_FUNC_ACL): Don't test for libpacl. * lib/acl-internal.h (rpl_acl_get_fd, rpl_acl_set_fd): Remove functions. * lib/acl-internal.c (acl_access_nontrivial): Remove code for OSF/1. * lib/acl_entries.c (acl_entries): Likewise. * lib/file-has-acl.c (fdfile_has_aclinfo): Likewise. * lib/set-permissions.c (acl_from_mode): Likewise. * doc/acl-resources.txt: Remove info about OSF/1.