vfork test on Solaris/Sparc

[H.J. Lu]

> 
> > > Shouldn't the -DGOOD version be used?
> 
> > Yes.
> 
> > > Is that a bug in vfork test in autoconf?
> 
> > Yes.
> 
> Can I get as little more context here?  I'm not familiar with this `GOOD'
> define, and find it hard to believe that this is the name of a
> preprocessor macro that would feature in C library headers for altering
> the behaviour of vfork().
> 

Solaris is not my main target and I took another look at the code.
It seems that my Solaris may have a vfork bug. I don't have the
time for it.

-- 
H.J. Lu (hjl@gnu.org)