Issue #27194: superfluous truncate calls in tarfile.py slow down extraction

Patch by Jason Fried.
diff --git a/Misc/ACKS b/Misc/ACKS
index 001373b..be303e0 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -458,6 +458,7 @@
 Martin Franklin
 Kent Frazier
 Bruce Frederiksen
+Jason Fried
 Robin Friedrich
 Bradley Froehle
 Ivan Frohne