videomixer: Add i387 floating point registers to the clobbered registers list
They are the same as the mm0-mm7 MMX registers and will be overwritten by the assembly code if gcc doesn't know about the MMX registers. Note: They're all added to the list of clobbered registers in all cases and not only when __MMX__ is not defined just to make sure that no other bugs happen with this code just because some compiler version gets things wrong. Fixes bug #614466.
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