[Merge] ~smspillaz/compiz:buffer-age-egl into compiz:master

[Dmitry Shachnev]

The proposal to merge ~smspillaz/compiz:buffer-age-egl into compiz:master has been updated.

Commit message changed to:

Enable EGL_EXT_buffer_age on USE_GLES where it is advertised.

For more details, see:
https://code.launchpad.net/~smspillaz/compiz/+git/compiz/+merge/412181
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