Make the unicode equality test an external function rather than in-lining it.

Make the unicode equality test an external function rather than in-lining it.

The real benefit of the unicode specialized function comes from
bypassing the overhead of PyObject_RichCompareBool() and not
from being in-lined (especially since there was almost no shared
data between the caller and callee).  Also, the in-lining was
having a negative effect on code generation for the callee.