[AD] yet another windows diff

["Isaac Cruz" <icruzbal@xxxxxxxxxx>]

I have changed completely the update logic in windowed driver: now it doesn't
update the window 70 times a second, instead only when it's necessary, and only
parts of screen which have changed. With the test program it's a bit slower,
because it updates the window whenever screen changes, but it's more accurate. I
have tried demo, and it works really smooth (60-70 fps) using dirty rectangles
or
page flipping (with desktop at 16 bit).

Added an accelerated vline (with Blt)

Moved asm code in wddlock.c to another file asmlock.s. I have used pointers to
functions in order to call a C function (it works with MSVC, please test it with
other
compilers)

Attachment: windows2.zip
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