updates for Android platform backward compatibility
fix dll import of libgles on Samsung S4 Android 4.3

 - libGLESv3 is not available for dll import on S4
 - because it should be symlink to libGLESv2 anyway,
   we just use that lib
 - from source.android.com/compatibility/android-4.3-cdd.pdf

    Note that device implementations MUST include libGLESv3.so and it
    MUST symlink (symbolic) link to libGLESv2.so. On device
    implementations that declare support for OpenGL ES 3.0,
    libGLESv2.so MUST export the OpenGL ES 3.0 function symbols in
    addition to the OpenGL ES 2.0 function symbols.