[HarfBuzz] pkg-config not checked for by autoconf

[suzuki toshiya]

Shriramana Sharma wrote:
> 2011/8/2 suzuki toshiya <mpsuzuki at hiroshima-u.ac.jp>
>> Thank you for posting with new & appropriate subject.
> 
> How about the autoconf and libtool dependencies? Perhaps they are too
> elementary and it is "understood" that they should be present?

Hmm, the availability of autoconf is checked by the check for
autoreconf (which is included in autoconf package, usually).
I will check whether autoreconf issues some nice error if
libtool is missing.

Regards,
mpsuzuki