[3.11] pythongh-108927: Include new dir test/regrtestdata in the inst…

…allation (pythonGH-112765)

(cherry picked from commit f8c0198)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
Co-authored-by: Victor Stinner <vstinner@python.org>

Makefile.pre.in

@@ -1959,6 +1959,9 @@ TESTSUBDIRS=	ctypes/test \
 		test/imghdrdata \
 		test/leakers \
 		test/libregrtest \
+		test/regrtestdata \
+		test/regrtestdata/import_from_tests \
+		test/regrtestdata/import_from_tests/test_regrtest_b \
 		test/sndhdrdata \
 		test/subprocessdata \
 		test/support \