Issue #14541: Added test/sndhdrdata to Makefile.pre.in for installation.
diff --git a/Makefile.pre.in b/Makefile.pre.in
index a85f8dd..9cc15c9 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -917,7 +917,8 @@
LIBSUBDIRS= tkinter tkinter/test tkinter/test/test_tkinter \
tkinter/test/test_ttk site-packages test \
test/capath test/data \
- test/cjkencodings test/decimaltestdata test/xmltestdata test/subprocessdata \
+ test/cjkencodings test/decimaltestdata test/xmltestdata \
+ test/subprocessdata test/sndhdrdata \
test/tracedmodules test/encoded_modules \
concurrent concurrent/futures encodings \
email email/mime email/test email/test/data \