libgeotiff: fix static linking issue

This commit adds a patch to improve the libgeotiff configure script to
use pkg-config to detect libtiff, which allows to properly take into
account dependant libraries such as libz and libjpeg.

As a consequence, we now autoreconf the libgeotiff package, and add
host-pkgconf as a dependency.

Fixes:

  http://autobuild.buildroot.org/results/649/6498d6516a412b12d68fa9f6a66172021abadc34/



Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>