As IOCTL_VIDEO_GET_CURRENT_MODE returns 2 as ModeIndex, wait for the same value
in IOCTL_VIDEO_SET_CURRENT_MODE.
Also change vgaddi to send this hardcoded value.
vga_new also uses 2 as index for 640x480x16
There is no need to compile our DLLs as shared libraries since we are
managing symbols exports and imports through spec files.
On my system, this reduces the configure-time by a factor of two.