Define __Pyx_PyUnicode_AsStringAndSize() on PyPy

Cython/Utility/TypeConversion.c

@@ -203,7 +203,7 @@ static CYTHON_INLINE const char* __Pyx_PyObject_AsString(PyObject* o) {
     return __Pyx_PyObject_AsStringAndSize(o, &ignore);
 }
 
-#if CYTHON_COMPILING_IN_CPYTHON && (__PYX_DEFAULT_STRING_ENCODING_IS_ASCII || __PYX_DEFAULT_STRING_ENCODING_IS_DEFAULT)
+#if __PYX_DEFAULT_STRING_ENCODING_IS_ASCII || __PYX_DEFAULT_STRING_ENCODING_IS_DEFAULT
 #if !CYTHON_PEP393_ENABLED
 static const char* __Pyx_PyUnicode_AsStringAndSize(PyObject* o, Py_ssize_t *length) {
     char* defenc_c;
@@ -251,7 +251,7 @@ static CYTHON_INLINE const char* __Pyx_PyUnicode_AsStringAndSize(PyObject* o, Py
 
 // Py3.7 returns a "const char*" for unicode strings
 static CYTHON_INLINE const char* __Pyx_PyObject_AsStringAndSize(PyObject* o, Py_ssize_t *length) {
-#if CYTHON_COMPILING_IN_CPYTHON && (__PYX_DEFAULT_STRING_ENCODING_IS_ASCII || __PYX_DEFAULT_STRING_ENCODING_IS_DEFAULT)
+#if __PYX_DEFAULT_STRING_ENCODING_IS_ASCII || __PYX_DEFAULT_STRING_ENCODING_IS_DEFAULT
     if (
 #if PY_MAJOR_VERSION < 3 && __PYX_DEFAULT_STRING_ENCODING_IS_ASCII
             __Pyx_sys_getdefaultencoding_not_ascii &&