Log Message:
Update to 1.3.3:

Changes:

Gaetan Nadon (3):
      xtrans.m4: fix warning by replacing obsolete AC_HELP_STRING
      xtrans.m4: replace deprecated AC_HAVE_LIBRARY with AC_CHECK_LIB
      xtrans.m4: remove AC_TYPE_SIGNAL and Imake SIGNALRETURNSINT

Hans de Goede (1):
      xtrans 1.3.3

Jon TURNEY (1):
      Add TransIsListening()

Mark Kettenis (3):
      Remove unused static inlines
      Fix alignment issues in FD passing code
      Don't restrict FD passing to Linux & Solaris

Łukasz Stelmach (2):
      Define TRANS_RECEIVED flag for transports
      Enable systemd socket activation