[Pixman] MIPS DSPr2: Fix for over_n_8888_8888_ca/over_n_8888_0565_ca routines.

[Nemanja Lukic]

After introducing new PRNG (pseudorandom number generator) a bug in two DSPr2
routines was revealed. Bug manifested by wrong calculation in composite and
glyph tests, which caused make check to fail for MIPS DSPr2 optimizations.
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