* debian/patches: enable support for GLES compatible builds (LP: #935124)
  - 30_use-glx-if-cogl-supports.patch: replace
    04_remove-glx-dependency-on-armel.patch with a better solution from
    upstream, that is to check the glx support with cogl
  - 31_don-t-link-directly-to-libGL.patch: don't link directly to libGL, as
    it's not needed anymore and breaks GLES support
  - 32_remove-shell-screen-grabber.patch: remove shell-screen-grabber as
    it's not needed anymore and breaks GLES support
  - 33_remove_glx_headers.patch: don't generically include the GL headers
* debian/rules:
  - Request it to run autoconf to update with the new options provided by
    the additional patches
* debian/control.in:
  - Adding autoconf at build-deps, requirement from above patches