Fixed issue #1564: The set implementation should special-case PyUnicode instead of PyString
I moved the unicode_eq to stringlib/eq.h to keep the function static and possible inline for setobject.c and dictobject.h. I also removed the unused _PyString_Eq method. If it's required in the future it can be added to eq.h
diff --git a/Objects/dictobject.c b/Objects/dictobject.c
index ae400b6..05252d7 100644
--- a/Objects/dictobject.c
+++ b/Objects/dictobject.c
@@ -8,6 +8,7 @@
 */
 
 #include "Python.h"
+#include "stringlib/eq.h"
 
 
 /* Set a key error with the specified argument, wrapping it in a
@@ -327,25 +328,6 @@
 	return 0;
 }
 
-/* Return 1 if two unicode objects are equal, 0 if not. */
-static int
-unicode_eq(PyObject *aa, PyObject *bb)
-{
-	PyUnicodeObject *a = (PyUnicodeObject *)aa;
-	PyUnicodeObject *b = (PyUnicodeObject *)bb;
-
-	if (a->length != b->length)
-		return 0;
-	if (a->length == 0)
-		return 1;
-	if (a->str[0] != b->str[0])
-		return 0;
-	if (a->length == 1)
-		return 1;
-	return memcmp(a->str, b->str, a->length * sizeof(Py_UNICODE)) == 0;
-}
-
-
 /*
  * Hacked up version of lookdict which can assume keys are always
  * unicodes; this assumption allows testing for errors during