change the cache size for re.escape

The rationale for this change is as follows:

re.escape() is only used to cache single Unicode characters
in shell patterns; we may heuristically assume that they are
ISO-8859-1 encodable, thereby requiring a cache of size 256.
To allow non-traditional glyphs (or alphabets with a small
number of common glpyhs), we double the cache size.

Lib/fnmatch.py

@@ -81,7 +81,7 @@ def translate(pat):
     return _join_translated_parts(parts, indices)
 
 _re_setops_sub = re.compile(r'([&~|])').sub
-_re_escape = functools.lru_cache(maxsize=32768)(re.escape)
+_re_escape = functools.lru_cache(maxsize=512)(re.escape)
 
 def _translate(pat, star, question_mark):
     res = []