eglibc: __slow_ieee754_sqrt{, f} functions for ppc e6500-32b

    *fix the following error:
    |/sysdeps/powerpc/powerpc32/e6500/fpu/e_sqrt.c:138:1:
    | error: redefinition of '__ieee754_sqrt'
    | __ieee754_sqrt (double x)

Signed-off-by: Chunrong Guo <B40290@freescale.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>