THRIFT-4098 Namespace support for generated Rust code (#2348)

Client: rs
diff --git a/configure.ac b/configure.ac
index a70a812..98327f4 100755
--- a/configure.ac
+++ b/configure.ac
@@ -797,6 +797,12 @@
   lib/rb/Makefile
   lib/rs/Makefile
   lib/rs/test/Makefile
+  lib/rs/test_recursive/Makefile
+  lib/rs/test_recursive/src/Makefile
+  lib/rs/test_recursive/src/maintenance/Makefile
+  lib/rs/test_recursive/src/transit/Makefile
+  lib/rs/test_recursive/src/transit/light/Makefile
+  lib/rs/test_recursive/src/transit/services/Makefile
   lib/lua/Makefile
   lib/swift/Makefile
   lib/ts/Makefile