posix_spawn (was: Bugs with execline/s6 documentation and skalibs functions using posix_spawn())

[Laurent Bercot]

 I pushed a workaround to the skalibs git.
 Could you please try a build on a machine that exhibits the early
return behaviour and tell me if
 - the behaviour is correctly detected by ./configure (the last sysdep)
 - the child_spawn*() family of functions now works properly even on
this machine?

 Also, can you please tell me what version of glibc these distribution
versions are running?

 Thanks!

--
 Laurent