package/upmpdcli: add patch to fix jsoncpp detection

package/upmpdcli: add patch to fix jsoncpp detection

Although jsoncpp is present, the build system of upmpdcli does not detect it.

The default installation path for the header files of jsoncpp is
{prefix}/json, but some systems (Debian) prefers to install the headers
in {prefix}/jsoncpp/json.

The build system only checks for the header files in
{prefix}/jsoncpp/json, so jsoncpp is not found.

This patch from upstream handles both cases now when checking for the jsoncpp
library.

The patch is squashed of two commits from upstream:
1/ aba96db0cfe8a2e5c825f4448c0ad184e21b50e1
2/ ce144f19a8c2e8c1e0ec3fe53699e874e5eb43fe

Fixes:
http://autobuild.buildroot.net/results/5bc6c558fccea0e1e1936894ce372f2b7b8ecac2
http://autobuild.buildroot.net/results/9c2d3892f17c240c44f7255d821d66acbed361f0
http://autobuild.buildroot.net/results/4d22729535ca4e6acbb48a25145611bb49c10149
http://autobuild.buildroot.net/results/fda321774c3eb225f966dd9f83def5329b703a03
http://autobuild.buildroot.net/results/f5eb306b0032e830f7f72ce80e318aa11774a5d1

.. and many more!

Signed-off-by: Jörg Krause <joerg.krause@embedded.rocks>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>