[HarfBuzz] pkg-config not checked for by autoconf

[suzuki toshiya]

Thank you for posting with new & appropriate subject.
Just I've posted a patch (make autogen.sh check pkg-config
availability) to bugzilla
	https://bugs.freedesktop.org/show_bug.cgi?id=39763
Let's wait for Behdad's comment...

Regards,
mpsuzuki

Shriramana Sharma wrote:
> Hello -- pursuant to the recent post about ragel not being checked by
> configure, I post this
> 
> You would have noticed my recent posts on the HB list (and the kind
> replies by mpsuzuki). The autoconf script doesn't check for
> pkg-config. Can you fix that too?
>