[waffle] Remove libgbm/libGL linktime dependency

[Chad Versace]

Emil, please collect my reviewed-bys onto your branch and look over the 
changes in my v2 of patch 4. If all looks good to you, let me know and 
I'll merge branch.

On Mon 10 Nov 2014, Emil Velikov wrote:
>Hello all,
>
>As the name suggests, the series removes the hard dependency of waffle
>of the two libraries.
>
>Note, due to the lack of link against libGL or libEGL in the final
>waffle, currently gbm will FAIL yet that is a mesa issue, which ought
>to be resolved by the time next waffle is released.
>Alternatively we'll use a hack as suggested by Frank.
>
>The series can be found in branch for-chad/remove-libgbm-libgl-libdeps
>over at github.
>
>Cheers,
>Emil
>
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