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vrend: prefer glGetTexImage on GL

Gurchetan Singh requested to merge gurchetansingh/virglrenderer:improve-gl-readback into master

Given a source and destination image, consider the following sequence of events:

  1. glTexImage with src
  2. virgl_resource_copy_region copies src to dst using GL
  3. mesa attempts to readback dst, which returns the correct result with vrend_transfer_send_getteximage only

Commands that reproduce this scenario on i965/qemu: ./bin/arb_copy_image-formats -auto ./bin/fbo-generatemipmap-formats GL_ARB_texture_float -auto

Edited by Erik Faye-Lund

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