python-zstandard: apply big-endian fix (issue6188)

This is a port of commit d4baf1f95b811f40773f5df0d8780fb2111ba6f5
from the upstream project to fix python-zstandard on 64-bit big-endian.

contrib/python-zstandard/c-ext/decompressor.c

@@ -68,13 +68,13 b' static int Decompressor_init(ZstdDecompr'
 	};
 
 	ZstdCompressionDict* dict = NULL;
-	size_t maxWindowSize = 0;
+	Py_ssize_t maxWindowSize = 0;
 	ZSTD_format_e format = ZSTD_f_zstd1;
 
 	self->dctx = NULL;
 	self->dict = NULL;
 
-	if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|O!II:ZstdDecompressor", kwlist,
+	if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|O!nI:ZstdDecompressor", kwlist,
 		&ZstdCompressionDictType, &dict, &maxWindowSize, &format)) {
 		return -1;
 	}