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Add framebuffer support (/dev/fb0)

First of all, WSL is great! Thanks for this amazing feature!

Now, please support frame-buffer device implementation, we develop many C/C++ apps that draws its graphs directly by open fb like this:

int open_framebuffer(void)
{
const char *fbname;
int ret;

fbname = getenv("FB");
if (fbname == 0)
fbname = "/dev/fb0";

ret = open(fbname, O_RDWR);
if (ret == -1)
ret = open("/dev/fb/0", O_RDWR);

return ret;
}

WSL has no framebuffer device yet, so please bring us a complete fb0 device!

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