meta,i965: Rip GL_EXT_texture_multisample_blit_scaled support out of meta

Merged Faith Ekstrand requested to merge gfxstrand/mesa:review/meta-no-msaa-scaled-blit into master

i965 is the only driver that ever linked to this code and it's been doing it in BLORP for a long time now. The only possible case where it would have fallen back to meta was for depth/stencil but that should have ended starting with 6cec618e. Rip out the dead code.

Edited by Faith Ekstrand

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