Fixed gles compilation.

We include CIrrDeviceLinux in our edit box widget and it doesn't respect irrlicht cmake flags, so that it tries to include opengl headers even if we selected gles renderer. Just move it to the cpp file to avoid redeclaration errors.

lib/irrlicht/source/Irrlicht/CIrrDeviceLinux.cpp

@@ -29,6 +29,14 @@ extern bool GLContextDebugBit;
 #include <X11/XKBlib.h>
 #include <X11/Xatom.h>
 
+#ifdef _IRR_COMPILE_WITH_OPENGL_
+#include <GL/gl.h>
+#ifdef _IRR_OPENGL_USE_EXTPOINTER_
+#define GLX_GLXEXT_PROTOTYPES
+#include "glxext.h"
+#endif
+#endif
+
 #ifdef _IRR_LINUX_XCURSOR_
 #include <X11/Xcursor/Xcursor.h>
 #endif

lib/irrlicht/source/Irrlicht/CIrrDeviceLinux.h

@@ -18,13 +18,8 @@
 #ifdef _IRR_COMPILE_WITH_X11_
 
 #ifdef _IRR_COMPILE_WITH_OPENGL_
-#include <GL/gl.h>
 #define GLX_GLXEXT_LEGACY 1
 #include <GL/glx.h>
-#ifdef _IRR_OPENGL_USE_EXTPOINTER_
-#define GLX_GLXEXT_PROTOTYPES
-#include "glxext.h"
-#endif
 #endif
 
 #include <X11/Xlib.h>