When blitting from a staging texture in SYSMEM to an as-yet uninitialized GPU
texture, we want to avoid ever loading the source texture into TEXTURE_RGB, or
loading the destination texture into SYSMEM.

This isn't really a proper fix for the relevant tests; it just manages to avoid
the problematic code path.

This manages to fix test_yv12_overlay because it causes those blits to use the
upload path (whereas currently they go through the raw blitter, and before
1632b8e7 they would go through the CPU blitter), and
wined3d_texture_gl_upload_data() is one of the only functions to correctly
handle planar YUV formats.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=52684Signed-off-by: Zebediah Figura <zfigura@codeweavers.com>
Signed-off-by: Henri Verbeet <hverbeet@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>