update zip_read_closer to incorporate zip64 support (#1041)

internal/file/test-fixtures/generate-zip-fixture-from-source-dir.sh

@@ -3,5 +3,10 @@ set -eux
 
 # $1 —— absolute path to destination file, should end with .zip, ideally
 # $2 —— absolute path to directory from which to add entries to the archive
+# $3 —— if files should be zip64 or not
 
-pushd "$2" && find . -print | zip "$1" -@ && popd
+if [[$3]]; then
+	pushd "$2" && find . -print | zip -fz "$1" -@ && popd
+else
+	pushd "$2" && find . -print | zip "$1" -@ && popd
+fi