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Add the default precision for floats in generated GLSL ES shaders

Neil Roberts requested to merge nroberts/piglit:generated-test-return-precision into master

In GLSL ES fragment shaders there is no default precision for floats. The generated shaders are using floats in the return type of a function. These have undefined precision so the shaders should be invalid.

Mesa has started detecting this since 95927c414ff so the tests have started failing.

I’m not sure how I missed this when I did a Jenkins run for that patch :/

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