bpo-40495: compileall option to hardlink duplicate pyc files (GH-19901)

compileall is now able to use hardlinks to prevent duplicates in a
case when .pyc files for different optimization levels have the same content.

Co-authored-by: Miro Hrončok <miro@hroncok.cz>
Co-authored-by: Victor Stinner <vstinner@python.org>
diff --git a/Misc/ACKS b/Misc/ACKS
index f744de6..b479aa5 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -86,6 +86,7 @@
 Alfonso Baciero
 Dwayne Bailey
 Stig Bakken
+Lumír Balhar
 Aleksandr Balezin
 Greg Ball
 Lewis Ball