easydbus: fix build without C++

Specify that easydbus is a C project file otherwise build will fail if
no C++ compiler is found by cmake

Fixes:
 - http://autobuild.buildroot.org/results/486c3cd98124e7415dee2fd1463bd5e0fcc9ba91

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/easydbus/0001-easydbus-is-a-C-project-file.patch

@@ -0,0 +1,33 @@
+From a4bd47f593fbe55bd3ab17532e64be74aff5b29d Mon Sep 17 00:00:00 2001
+From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+Date: Sat, 17 Nov 2018 11:38:05 +0100
+Subject: [PATCH] easydbus is a C project file
+
+Specify that easydbus is a C project file otherwise build will fail if
+no C++ compiler is found by cmake
+
+Fixes:
+ - http://autobuild.buildroot.org/results/486c3cd98124e7415dee2fd1463bd5e0fcc9ba91
+
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+[Upstream status: https://github.com/mniestroj/easydbus/pull/2]
+---
+ CMakeLists.txt | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 58ccb2d..575eb24 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -5,7 +5,7 @@
+ #
+ 
+ cmake_minimum_required(VERSION 2.6)
+-project(easydbus)
++project(easydbus C)
+ 
+ add_definitions("-Wall -Wextra -Wno-unused-parameter")
+ set(CMAKE_C_FLAGS_RELEASE "-O2")
+-- 
+2.17.1
+