[PATCH][BZ #3268] use soft-fp fma in powerpc32/nofpu

[Steven Munroe]

This patch overrides s_fma.c and s_fmaf.c in powerpc32/nofpu to call the __fmadf4()/__fmasf4() soft-fp fma functions.  I also added __fmadf4/__fmasf4 to the Versions file to export them from libc.so so s_fma.c/s_fmaf.c (in libm.so) can call them. 



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