Merge branch 'dbus-1.4' and update NEWS further

diff --cc NEWS
index ff5c963,47d2159..3b8ad9f
--- 1/NEWS
--- 2/NEWS
+++ b/NEWS
@@@ -1,32 -1,24 +1,49 @@@
 -D-Bus 1.4.16 (UNRELEASED)
++D-Bus 1.5.8 (UNRELEASED)
+ ==
+ 
++• Clean up dead code (fd.o #39231, Simon McVittie)
++
+ • Add a regression test for fd.o #38005 (fd.o #39836, Simon McVittie)
+ 
++• Make "NOCONFIGURE=1 ./autogen.sh" not run configure (Colin Walters)
++
+ • Unix-specific:
+   · Clean up (non-abstract) Unix sockets on bus daemon exit (fd.o #38656;
+     Brian Cameron, Simon McVittie)
++  · On systems that use libcap-ng but not systemd, drop supplemental groups
++    when switching to the daemon user (Red Hat #726953, Steve Grubb)
+   · Make the cmake build work again on GNU platforms (fd.o #29228,
+     Simon McVittie)
+ 
 -D-Bus 1.4.14 (2011-07-29)
 +D-Bus 1.5.6 (2011-07-29)
  ==
  
 -The "Puny receptacle!" release.
 +The "weird, gravy-like aftertaste" release.
  
 -Changes:
 +In addition to new features and refactoring, this release contains all of the
 +bugfixes from 1.4.14.
 +
 +Potentially incompatible (Bustle and similar debugging tools will need
 +changes to work as intended):
 +
 +• Do not allow match rules to "eavesdrop" (receive messages intended for a
 +  different recipient) by mistake: eavesdroppers must now opt-in to this
 +  behaviour by putting "eavesdrop='true'" in the match rule, which will
 +  not have any practical effect on buses where eavesdropping is not allowed
 +  (fd.o #37890, Cosimo Alfarano)
 +
 +Other changes:
 +
 +• D-Bus Specification version 0.18 (fd.o #37890, fd.o #39450, fd.o #38252;
 +  Cosimo Alfarano, Simon McVittie)
 +  · add the "eavesdrop" keyword to match rules
 +  · define eavesdropping, unicast messages and broadcast messages
 +  · stop claiming that match rules are needed to match unicast messages to you
 +  · promote the type system to be a top-level section
  
  • Use DBUS_ERROR_OBJECT_PATH_IN_USE if dbus_connection_try_register_object_path
 -  or dbus_connection_try_register_fallback fails, not ...ADDRESS_IN_USE
 -  (fd.o #38874, Jiří Klimeš)
 +  or dbus_connection_try_register_fallback fails, not ...ADDRESS_IN_USE,
 +  and simplify object-path registration (fd.o #38874, Jiří Klimeš)
  
  • Consistently use atomic operations on everything that is ever manipulated
    via atomic ops, as was done for changes to DBusConnection's refcount in