Version 239.1 Release

This is the first release of the v239 series.

Fixes
 * Fix compatibility issues with glibc-2.28
 * Fix missing creation of systemshutdowndir and systemsleepdir
 * Fix elogind being non-reactive to laptop lid events
 * Fix an issue with program_invocation[_short]_name when non-glibc
   libc implementations are used that provide these globals
 * Fix session finalization, sessions no longer stay as "closing"
   forever.

Changes and Additions
 * Added support for the new 'suspend-then-hibernate' method
 * Added elogind-inhibit.xml to generate the elogind-inhibit man page
 * Support system_bus_socket to be found in /var/run/dbus as well as
   /run/dbus
 * The sytemd build options for valgrind can now be used
 * Added execution of executables in systemshutdowndir
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