Otherwise the corresponding files are still installed in /etc/security.

* configure.ac (AC_SUBST): Add VENDOR_SCONFIGDIR.
(AM_CONDITIONAL): Add HAVE_VENDORDIR.
* modules/*/Makefile.am (secureconfdir): Set to VENDOR_SCONFIGDIR
if HAVE_VENDORDIR has been set, otherwise to SCONFIGDIR.

Changed files
--------------

Make.xml.rules.in:
- Using RNG file instead of DTD file for checking XML files.
- Taking the correct stylesheet for README files.

doc/sag/Makefile.am, doc/adg/Makefile.am, doc/mwg/Makefile.am:
- Using RNG file instead of DTD file for checking XML files.

configure.ac:
- Adding a new option for selecting RNG check file (-enable-docbook-rng)
- Switching stylesheets to docbook 5
- Checking DocBook 5 environment instead of DocBook 4 environment

*.xml:
Update from DockBook 4 to DocBook 5

* modules/pam_echo/tst-pam_echo-retval.c: New file.
* modules/pam_echo/Makefile.am (TESTS): Add $(check_PROGRAMS).
(check_PROGRAMS, tst_pam_echo_retval_LDADD): New variables.

Starting with commit a684595c0bbd88df71285f43fb27630e3829121e aka
Linux-PAM-1.3.0~14 (Remove "--enable-static-modules" option and support
from Linux-PAM), PAM_SM_* macros have no effect.

... and remove $(TESTS) from EXTRA_DIST.

The change is performed automatically using the following script:
  sed -i -e 's/^TESTS = \(tst.*\)/dist_check_SCRIPTS = \1\nTESTS = $(dist_check_SCRIPTS)/' \
         -e '/^EXTRA_DIST/ s/ \$(TESTS)//' modules/*/Makefile.am

... and remove $(MANS) from EXTRA_DIST.

The change is performed automatically using the following script:
  sed -i 's/^man_MANS/dist_&/; /^EXTRA_DIST/ s/ \$(MANS)//' modules/*/Makefile.am

... and remove $(DATA) from EXTRA_DIST.

The change is performed automatically using the following script:
  sed -i 's/^[a-z]*_DATA/dist_&/; /^EXTRA_DIST/ s/ \$(DATA)//' modules/*/Makefile.am

Since the GNU Automake distributes README files by default, the only
reason why README had to be listed in EXTRA_DIST was to make these
README files generated.

Since README is also listed in noinst_DATA, we can safely replace
README in EXTRA_DIST with $(DATA), this also opens the way for
further EXTRA_DIST cleanup.

* modules/*/Makefile.am (EXTRA_DIST): Replace README with $(DATA).

This is essentially a no-op change that makes modules/*/Makefile.am
files less divergent.

As the rule is now the same in every modules/*/Makefile.am file,
move it to Make.xml.rules.

* Make.xml.rules (README): New prerequisites rule.
* modules/pam_access/Makefile.am (README): Remove rule.
* modules/pam_cracklib/Makefile.am (README): Likewise.
* modules/pam_debug/Makefile.am (README): Likewise.
* modules/pam_deny/Makefile.am (README): Likewise.
* modules/pam_echo/Makefile.am (README): Likewise.
* modules/pam_env/Makefile.am (README): Likewise.
* modules/pam_exec/Makefile.am (README): Likewise.
* modules/pam_faildelay/Makefile.am (README): Likewise.
* modules/pam_filter/Makefile.am (README): Likewise.
* modules/pam_ftp/Makefile.am (README): Likewise.
* modules/pam_group/Makefile.am (README): Likewise.
* modules/pam_issue/Makefile.am (README): Likewise.
* modules/pam_keyinit/Makefile.am (README): Likewise.
* modules/pam_lastlog/Makefile.am (README): Likewise.
* modules/pam_limits/Makefile.am (README): Likewise.
* modules/pam_listfile/Makefile.am (README): Likewise.
* modules/pam_localuser/Makefile.am (README): Likewise.
* modules/pam_loginuid/Makefile.am (README): Likewise.
* modules/pam_mail/Makefile.am (README): Likewise.
* modules/pam_mkhomedir/Makefile.am (README): Likewise.
* modules/pam_motd/Makefile.am (README): Likewise.
* modules/pam_namespace/Makefile.am (README): Likewise.
* modules/pam_nologin/Makefile.am (README): Likewise.
* modules/pam_permit/Makefile.am (README): Likewise.
* modules/pam_pwhistory/Makefile.am (README): Likewise.
* modules/pam_rhosts/Makefile.am (README): Likewise.
* modules/pam_rootok/Makefile.am (README): Likewise.
* modules/pam_securetty/Makefile.am (README): Likewise.
* modules/pam_selinux/Makefile.am (README): Likewise.
* modules/pam_sepermit/Makefile.am (README): Likewise.
* modules/pam_setquota/Makefile.am (README): Likewise.
* modules/pam_shells/Makefile.am (README): Likewise.
* modules/pam_succeed_if/Makefile.am (README): Likewise.
* modules/pam_tally/Makefile.am (README): Likewise.
* modules/pam_tally2/Makefile.am (README): Likewise.
* modules/pam_time/Makefile.am (README): Likewise.
* modules/pam_timestamp/Makefile.am (README): Likewise.
* modules/pam_tty_audit/Makefile.am (README): Likewise.
* modules/pam_umask/Makefile.am (README): Likewise.
* modules/pam_unix/Makefile.am (README): Likewise.
* modules/pam_userdb/Makefile.am (README): Likewise.
* modules/pam_usertype/Makefile.am (README): Likewise.
* modules/pam_warn/Makefile.am (README): Likewise.
* modules/pam_wheel/Makefile.am (README): Likewise.
* modules/pam_xauth/Makefile.am (README): Likewise.