shapelib: new package

Signed-off-by: Zoltan Gyarmati <mr.zoltan.gyarmati@gmail.com>
[Thomas:
 - adjust the license: it's MIT or LGPLv2, add web/license.html to the
   license files
 - rewrap Config.in help text
 - add entry to the DEVELOPERS file.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>