build with ubuntu16.04

[lowlyw]

ubuntu 16.04 requires this patch because of location of the libraries.
this patch fixes it for ubuntu

vagrant@vagrant-ubuntu-trusty-64:~/degate$ git diff
diff --git a/gui/OpenGLRendererBase.cc b/gui/OpenGLRendererBase.cc
index f1b141e..13adcc9 100644
--- a/gui/OpenGLRendererBase.cc
+++ b/gui/OpenGLRendererBase.cc
@@ -27,10 +27,10 @@
 #include <GL/glu.h>

 #include <ft2build.h>
-#include <freetype/freetype.h>
-#include <freetype/ftglyph.h>
-#include <freetype/ftoutln.h>
-#include <freetype/fttrigon.h>
+#include <freetype2/freetype.h>
+#include <freetype2/ftglyph.h>
+#include <freetype2/ftoutln.h>
+#include <freetype2/fttrigon.h>

 #include <boost/foreach.hpp>
 #include <iostream>

[XVilka]

@lowlyw What about creating Pull Request instead?

[XVilka]

@lowlyw ping?