pkg-config zlib check in 3c13bc

[Xīcò]

On Sat, May 10, 2014 at 09:46:00AM +0900, David Bremner wrote:
> > int main(void)
> > {
> >     return(ZLIB_VERNUM >= 0x1252);
> > }
> 
> OK, that sounds like it could work.  Ideally, somebody on FreeBSD could
> check...
> 
> d

Such check will work on FreeBSD, and would be great!

As a side note, is there any rationale for the hand-made configure? Not
that I am a big fan of autoconf/cmake/whatever either...