glsl: do not make sampler/image types readonly variables

In plain GLSL, sampler and image types can only be declared
uniform-qualified global variables or 'in' function parameters.

Setting the read_only flag seems quite useless because other
checks will prevent sampler/image variables to be assigned and
also because the flag is not set for atomic_uint types which are
opaque types.

This will also help for ARB_bindless_texture because samplers
and images can be assigned when they are considered bindless.

Signed-off-by: Samuel Pitoiset <[email protected]>
Reviewed-by: Nicolai Hähnle <[email protected]>
Reviewed-by: Timothy Arceri <[email protected]>

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