implement a real loader for EGL drivers

we now look for a config file in /system/lib/egl/egl.cfg that describes the association of a display to a driver.
these drivers are named: /system/lib/egl/lib{[EGL|GLESv1_CM|GLESv2] | GLES}_$TAG.so
diff --git a/opengl/libs/egl_impl.h b/opengl/libs/egl_impl.h
index 80455d0..c5f753d 100644
--- a/opengl/libs/egl_impl.h
+++ b/opengl/libs/egl_impl.h
@@ -31,7 +31,7 @@
 
 struct egl_connection_t
 {
-    void volatile *     dso;
+    void *              dso;
     gl_hooks_t *        hooks;
     EGLint              major;
     EGLint              minor;