BUG: Fix #define for ppc64 and ppc64le

The current logic for defining NPY_CPU_PPC64LE and NPY_CPU_PPC64 is
incorrect for two reasons:
1) The elif defined for __powerpc__ is proceesed first so any
ppc64le or ppc64 system is defined as NPY_CPU_PPC.
2) __ppc64le__ is not defined on a ppc64le system. __PPC64__ is
defined and so is __powerpc64__ but the check for little or
big endian needs to be done seperately.

This pull request fixes the defines for ppc64le and ppc64.
Note: This really isn't a issue in the numpy code base at this time
because the only place this variable is referenced is in npy_endian.h
as a fallback in case endian.h is not on the system.
It would be good to fix in case future code does reference
these defines.

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