Fix compiler check

By default CMake looks for c++ which the project does not need.

Patch by Thomas:
http://lists.busybox.net/pipermail/buildroot/2015-December/146865.html

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>

diff -uNr read-edid-3.0.2.org/CMakeLists.txt read-edid-3.0.2/CMakeLists.txt
--- read-edid-3.0.2.org/CMakeLists.txt	2014-02-05 17:27:26.000000000 +0100
+++ read-edid-3.0.2/CMakeLists.txt	2015-12-13 16:08:43.000000000 +0100
@@ -1,5 +1,5 @@
 cmake_minimum_required (VERSION 2.6)
-project (read-edid)
+project (read-edid C)
 
 option(I2CBUILD "Build I2C get-edid implementation" ON)
 option(CLASSICBUILD "Build VBE get-edid implementation" ON)