[MPlayer-dev-eng] Patch to the draw_alpha functions

[Kim Minh Kaplan]

The optimized draw_alpha functions usually work by drawing 2, 4 or
even 8 pixels at a time.  When the image to draw's width is not a
multiple of these values, It draws to many pixels resulting in
subtitles with garbage on the right.  The following patch fixes this.

Kim Minh.
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