Merge branch 'collectd-4.8'

Conflicts:
	src/exec.c

diff --cc configure.in
Simple merge

diff --cc src/Makefile.am
Simple merge

diff --cc src/collectd.conf.pod
Simple merge

diff --cc src/curl.c
Simple merge

diff --cc src/exec.c
index bbd23df13b4d3f3afb8422d6b447aece3a5657cb,8719201ea956fe3129561889191fddab3f047a35..acc6cf6f12aa93ea7fc743e78cc378acaf78c29a
--- 1/src/exec.c
--- 2/src/exec.c
+++ b/src/exec.c
@@@ -479,7 -477,9 +488,11 @@@ static int fork_child (program_list_t *
        close (fd_pipe_err[1]);
      }
  
 +    set_environment ();
++
+     /* Unblock all signals */
+     reset_signal_mask ();
+ 
      exec_child (pl);
      /* does not return */
    }