Make bit able to build native tests.

It still can't run them. That's a lot of work.

Test: bit statsd_test
Change-Id: I8eb7e341956e698b4e5d110924f78f0485e02f67
diff --git a/tools/bit/make.cpp b/tools/bit/make.cpp
index a800241..b2ee99c 100644
--- a/tools/bit/make.cpp
+++ b/tools/bit/make.cpp
@@ -182,7 +182,7 @@
         for (ssize_t i = module.classes.size() - 1; i >= 0; i--) {
             string cl = module.classes[i];
             if (!(cl == "JAVA_LIBRARIES" || cl == "EXECUTABLES" || cl == "SHARED_LIBRARIES"
-                    || cl == "APPS")) {
+                    || cl == "APPS" || cl == "NATIVE_TESTS")) {
                 module.classes.erase(module.classes.begin() + i);
             }
         }