Add LTLIBICONV to popt.pc.in
Add LTLIBICONV to popt.pc.in

Add ${LTLIBICONV} to popt.pc.in so applications such as shairport-sync
will know that they must link with -liconv when building statically

Fixes:
 - http://autobuild.buildroot.org/results/c5b0d1d2867e49c022a2ad971dd9f358ff0f3865

Signed-off-by: Fabrice Fontaine <7d88633730b8b85c1516e612893df72eae9cd341@gmail.com>
[Retrieved (and slightly updated) from:
https://git.buildroot.net/buildroot/tree/package/popt/0004-add-libiconv-to-popt.pc.patch]
Signed-off-by: Fabrice Fontaine <7d88633730b8b85c1516e612893df72eae9cd341@gmail.com>

GerHobbelt/POPT,GerHobbelt/POPT,GerHobbelt/POPT