Linux-PAM release 1.5.2

* pam_exec: implemented quiet_log option.
* pam_mkhomedir: added support of HOME_MODE and UMASK from /etc/login.defs.
* pam_timestamp: changed hmac algorithm to call openssl instead of the bundled
                 sha1 implementation if selected, added option to select
                 the hash algorithm to use with HMAC.
* Added pkgconfig files for provided libraries.
* Added --with-systemdunitdir configure option to specify systemd unit
  directory.
* Added --with-misc-conv-bufsize configure option to specify the buffer size
  in libpam_misc's misc_conv() function, raised the default value for this
  parameter from 512 to 4096.
* Multiple minor bug fixes, portability fixes, documentation improvements,
  and translation updates.
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