shader_integer_mix is unsupported prior to 4.5

shader_integer_mix is unsupported prior to 4.5

This change adds logic to make sure shader_integer_mix.prototypes
with shader version prior to 4.5 is marked unsupported

It adds a new shaders45 group of tests to make sure core glsl 4.5
supports the extension

It adds the test shader_integer_mix.prototypes-negative to make sure
glsl versions that doesn't support the feature are returning an error

Finally it updates the mustpass list with the new tests

Affects:

KHR-GLES3.shaders.shader_integer_mix.prototypes-negative
KHR-GLES31.core.shader_integer_mix.prototypes-negative
KHR-GLES32.shaders.shader_integer_mix.prototypes-negative
KHR-GL33.shaders.shader_integer_mix.prototypes
KHR-GL33.shaders.shader_integer_mix.prototypes-negative
KHR-GL40.shaders.shader_integer_mix.prototypes
KHR-GL40.shaders.shader_integer_mix.prototypes-negative
KHR-GL41.shaders.shader_integer_mix.prototypes
KHR-GL41.shaders.shader_integer_mix.prototypes-negative
KHR-GL42.shaders.shader_integer_mix.prototypes
KHR-GL42.shaders.shader_integer_mix.prototypes-negative
KHR-GL43.shaders.shader_integer_mix.prototypes
KHR-GL43.shaders.shader_integer_mix.prototypes-negative
KHR-GL44.shaders.shader_integer_mix.prototypes
KHR-GL44.shaders.shader_integer_mix.prototypes-negative
KHR-GL45.shaders.shader_integer_mix.prototypes
KHR-GL45.shaders.shader_integer_mix.prototypes-negative
KHR-GL45.shaders45.shader_integer_mix.*

Components: OpenGL

VK-GL-CTS issue: 406

Change-Id: I574bec1a8d5aca0e4ec52b8df96abf45828b527a