Tacked on an additional isSky boolean that needs to be set in the material definition in order for it to trigger additional feature functionality.
On finding it, it flips on the MFT_SkyBox feature, which in turns appends the void DeferredSkyHLSL::processVert(  entries to a pre-existing definition for hlsl generation.
Merge pull request #15 from Azaezel/skyboxDrawOrderMK3

Skybox render order. 3rd times the charm.