error test fixes

tests/errors/e_strcoerce.pyx

@@ -13,5 +13,5 @@ _ERRORS = """
 2:14: Only single-character string literals can be coerced into ints.
 3:14: Only single-character string literals can be coerced into ints.
 6:15: Only single-character string literals can be coerced into ints.
-9:14: Unicode literals do not support coercion to C types other than Py_UNICODE.
+9:14: Unicode literals do not support coercion to C types other than Py_UNICODE or Py_UCS4.
 """

tests/errors/string_assignments.pyx

@@ -50,7 +50,7 @@ cdef list  l_f2 = b1
 cdef list  l_f3 = u1
 
 _ERRORS = u"""
-25:20: Unicode literals do not support coercion to C types other than Py_UNICODE.
+25:20: Unicode literals do not support coercion to C types other than Py_UNICODE or Py_UCS4.
 26:22: Unicode objects do not support coercion to C types.
 27:22: 'str' objects do not support coercion to C types (use 'bytes'?).