package/libupnpp: add patch to get pkg-config file

Apply a patch from upstream to install a pkg-config file for libupnpp.

Fetch from:
https://github.com/medoc92/libupnpp/commit/9f03bb0e7b47e2843edea6f25ed9eabbfb6412df

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

package/libupnpp/0002-Add-pkg-config-file.patch

@@ -0,0 +1,63 @@
+From 22ec8e3a2b54a4e1fd1340a592f49829d6cde735 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?J=C3=B6rg=20Krause?= <joerg.krause@embedded.rocks>
+Date: Sun, 11 Sep 2016 22:26:33 +0200
+Subject: [PATCH] Add pkg-config file
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Add a pkg-config file.
+
+Fetched from:
+https://github.com/medoc92/libupnpp/commit/9f03bb0e7b47e2843edea6f25ed9eabbfb6412df
+
+Signed-off-by: Jörg Krause <joerg.krause@embedded.rocks>
+---
+ Makefile.am    |  3 +++
+ configure.ac   |  1 +
+ libupnpp.pc.in | 12 ++++++++++++
+ 3 files changed, 16 insertions(+)
+ create mode 100644 libupnpp.pc.in
+
+diff --git a/Makefile.am b/Makefile.am
+index 2d20b9b..39559e9 100644
+--- a/Makefile.am
++++ b/Makefile.am
+@@ -112,3 +112,6 @@ nobase_include_HEADERS = \
+ libupnpp_la_LDFLAGS = -version-info $(VERSION_INFO)
+ 
+ libupnpp_la_LIBADD = $(LIBUPNPP_LIBS)
++
++pkgconfigdir = $(libdir)/pkgconfig
++pkgconfig_DATA = libupnpp.pc
+diff --git a/configure.ac b/configure.ac
+index 9ff2058..89525b3 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -90,4 +90,5 @@ AC_SUBST(LIBUPNPP_LIBS)
+ AC_SUBST(VERSION_INFO)
+ 
+ AC_CONFIG_FILES([Makefile])
++AC_CONFIG_FILES([libupnpp.pc])
+ AC_OUTPUT
+diff --git a/libupnpp.pc.in b/libupnpp.pc.in
+new file mode 100644
+index 0000000..90f4b2b
+--- /dev/null
++++ b/libupnpp.pc.in
+@@ -0,0 +1,12 @@
++prefix=@prefix@
++exec_prefix=@exec_prefix@
++libdir=@libdir@
++includedir=@includedir@
++
++Name: @PACKAGE_NAME@
++Description: C++ wrapper for libupnp
++Version: @PACKAGE_VERSION@
++Requires: libcurl libupnp
++Libs: -L${libdir} -lupnpp
++Libs.private: -lexpat -lpthread -lrt
++Cflags: -I${includedir}
+-- 
+2.9.3
+

package/libupnpp/libupnpp.mk

@@ -10,7 +10,9 @@ LIBUPNPP_LICENSE = GPLv2+
 LIBUPNPP_LICENSE_FILES = COPYING
 LIBUPNPP_INSTALL_STAGING = YES
 LIBUPNPP_DEPENDENCIES = expat libcurl libupnp
-# touching configure.ac in 0001-Check-for-std-future.patch
+# touching configure.ac in:
+#   0001-Check-for-std-future.patch
+#   0002-Add-pkg-config-file.patch
 LIBUPNPP_AUTORECONF = YES
 
 # configure script fails to link against the dependencies of libupnp