Linux-PAM release 1.5.3

* configure: added options to configure stylesheets.
* configure: added --enable-logind option to use logind instead of utmp
  in pam_issue and pam_timestamp.
* pam_modutil_getlogin: changed to use getlogin() from libc instead of parsing utmp.
* Added libeconf support to pam_env and pam_shells.
* Added vendor directory support to pam_access, pam_env, pam_group, pam_faillock,
  pam_limits, pam_namespace, pam_pwhistory, pam_sepermit, pam_shells, and pam_time.
* pam_limits: changed to not fail on missing config files.
* pam_pwhistory: added conf= option to specify config file location.
* pam_pwhistory: added file= option to specify password history file location.
* pam_shells: added shells.d support when libeconf and vendordir are enabled.
* Deprecated pam_lastlog: this module is no longer built by default because
  it uses utmp, wtmp, btmp and lastlog, but none of them are Y2038 safe,
  even on 64bit architectures.
  pam_lastlog will be removed in one of the next releases, consider using
  pam_lastlog2 (from https://github.com/thkukuk/lastlog2) and/or
  pam_wtmpdb (from https://github.com/thkukuk/wtmpdb) instead.
* Deprecated _pam_overwrite(), _pam_overwrite_n(), and _pam_drop_reply() macros
  provided by _pam_macros.h; the memory override performed by these macros can
  be optimized out by the compiler and therefore can no longer be relied upon.
* Multiple minor bug fixes, portability fixes, documentation improvements,
  and translation updates.
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