Add checksums to snowball-generated files [LUCENE-9925]

[asfimport]

---

Migrated from LUCENE-9925 by Dawid Weiss (@dweiss), resolved Apr 13 2021
Parent: #10910
Pull requests: #80

[asfimport]

ASF subversion and git services (migrated from JIRA)

Commit 0b1d8cc in lucene's branch refs/heads/main from Dawid Weiss
https://gitbox.apache.org/repos/asf?p=lucene.git;h=0b1d8cc

LUCENE-9925: add checksums to snowball-generated files (#80)

[asfimport]

Adrien Grand (@jpountz) (migrated from JIRA)

Closing after the 9.0.0 release