Add support for preserving ACL entries of files.
* configure.ac (acl): New option. (HAVE_POSIX_ACL): Test for POSIX ACL support. This is typically provided by libacl on GNU/Linux. * fileio.c (Ffile_acl, Fset_file_acl): New functions. (Fcopy_file): Change last arg to `preserve_extended_attributes' and copy ACL entries of file in addition to SELinux context if set. (syms_of_fileio): Add `file-acl' and `set-file-acl'. * Makefile.in (LIBACL_LIBS): New macro. (LIBES): Use it. * files.el (file-extended-attributes) (set-file-extended-attributes): New functions. (backup-buffer): Use them to handle both SELinux context and ACL entries. (backup-buffer-copy): Work with an alist of extended attributes, rather than an SELinux context. (basic-save-buffer-2): Ditto. * files.texi (File Attributes): Document ACL support and new `file-acl' function. (Changing Files): Mention argument name change of `copy-file' and document new function `set-file-acl'.
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