THRIFT-4547: Swift crosstests (#2670)

Co-authored-by: Jiayu Liu <Jimexist@users.noreply.github.com>
diff --git a/configure.ac b/configure.ac
index 9a71fc7..12c20de 100644
--- a/configure.ac
+++ b/configure.ac
@@ -821,6 +821,8 @@
   test/py.tornado/Makefile
   test/rb/Makefile
   test/rs/Makefile
+  test/swift/Makefile
+  test/swift/CrossTests/Makefile
   tutorial/Makefile
   tutorial/c_glib/Makefile
   tutorial/cl/Makefile