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glsl-1.10: fix glsl-fs-conditional-output-write test

Timothy Arceri requested to merge tarceri/piglit:fix_fs-conditional-output-write into main

Here we make sure gl_FragColor.x is always given a value. Otherwise the if (b) check, the coord uniform etc can all be optimised away because gl_FragColor.x can simply always be set to 1.0 as anything else is undefined.

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