(Merge 3.3) Issue #17223: array module: Fix a crasher when converting an array

containing invalid characters (outside range [U+0000; U+10ffff]) to Unicode:
repr(array), str(array) and array.tounicode(). Patch written by Manuel Jacob.

diff --cc Lib/test/test_array.py
Simple merge

diff --cc Misc/NEWS
Simple merge

diff --cc Modules/arraymodule.c
Simple merge