Add tests/cppextdata data to `TESTSUBDIRS`

diff --git a/Makefile.pre.in b/Makefile.pre.in
index b12a1bc060af90f74d277e62c062d23bda1c2c65..13aea3e3204c5522e57aca97c7ee5235d3828451 100644 (file)
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -2029,7 +2029,7 @@ LIBSUBDIRS=       asyncio \
                __phello__
 TESTSUBDIRS=   idlelib/idle_test \
                test test/audiodata \
-               test/capath test/cjkencodings \
+               test/capath test/cppextdata test/cjkencodings \
                test/data test/decimaltestdata \
                test/dtracedata test/eintrdata \
                test/encoded_modules test/imghdrdata \