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arb_texture_multisample: require geometry shaders

Erik Faye-Lund requested to merge kusma/piglit:dsa-texelfetch-geometry-shader into main

While not being explicit about it, the ARB_direct_state_access practically requires geometry shader support for proper glNamedFramebufferTexture support. The reason boils down to the spec being written against OpenGL 4.4 spec, while it only requires OpenGL 2.0. The EXT version of the spec, which is written against the OpenGL 2.1 spec does explicitly spell out the dependency.

This interpretation also match what Mesa does, so it seems reasonable to expect.

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