libiio: Add a patch from upstream to fix building without a C++ compiler

This fixes a build issue reported by the autobuilder:

   http://autobuild.buildroot.net/results/5b0d02aa3bdb4cddb0d316c99fada2e7ba9f9c1d/

[Thomas: add autobuilder reference, as suggested by Baruch.]

Signed-off-by: Paul Cercueil <paul.cercueil@analog.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/libiio/0002-cmake-fix-build-on-unix-systems-without-cpp.patch

@@ -0,0 +1,36 @@
+From 2e6fa357ffbe755bfecaecad4fc82e3307fe2831 Mon Sep 17 00:00:00 2001
+From: Paul Cercueil <paul.cercueil@analog.com>
+Date: Wed, 22 Jul 2015 10:25:01 +0200
+Subject: [PATCH] CMake: Fix build on UNIX systems without a C++ compiler
+
+Signed-off-by: Paul Cercueil <paul.cercueil@analog.com>
+---
+ bindings/csharp/CMakeLists.txt | 2 +-
+ bindings/python/CMakeLists.txt | 2 +-
+ 2 files changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/bindings/csharp/CMakeLists.txt b/bindings/csharp/CMakeLists.txt
+index 8aafb8f..fceab88 100644
+--- a/bindings/csharp/CMakeLists.txt
++++ b/bindings/csharp/CMakeLists.txt
+@@ -1,5 +1,5 @@
+ cmake_minimum_required(VERSION 2.8.7)
+-project(libiio-sharp)
++project(libiio-sharp LANGUAGES NONE)
+ 
+ find_program(MCS_EXECUTABLE
+ 	NAMES mcs csc
+diff --git a/bindings/python/CMakeLists.txt b/bindings/python/CMakeLists.txt
+index 22ffdb4..76ceae8 100644
+--- a/bindings/python/CMakeLists.txt
++++ b/bindings/python/CMakeLists.txt
+@@ -1,5 +1,5 @@
+ cmake_minimum_required(VERSION 2.8.7)
+-project(libiio-py)
++project(libiio-py LANGUAGES NONE)
+ 
+ include(FindPythonInterp)
+ 
+-- 
+2.1.4
+