Disable blink in 8bpp modes on MGA; Re-instate main 8bpp hires renderer

[iamgreaser]

Summary

This should fix the blinking in 8bpp modes on the Matrix Millennium.

What I've been using to test this:

In a non-CJK MS-DOS 6.2x, run debug, then:

a100
mov ax, 13
int 10
int 3

g=100
q

Now you're in mode 13h, run qbasic and then exit it. (esc, alt, f, x - all separate keys)

The background should be black. If it's reddish-brown, then you've ended up in the weird thing that is 8bpp blink mode, which is supported by some VGA clones but not all. The Matrox Millennium card sets the blink bit, so what this PR does is it tells the renderer to ignore the blink bit when bpp > 4 on a Matrox card.

Checklist

• I have discussed this with core contributors already

References

None