Make bit able to run gtest native tests.

The output parsing isn't ideal, so these are a bit more spammy
than I'd like, but at least they build, install and run without
the manual glop.

Test: bit incidentd_test
Change-Id: I3c34a4ebbf661f612b4b0f8b4e05cade8669b5a6
diff --git a/tools/bit/make.h b/tools/bit/make.h
index db0b69f..785912a 100644
--- a/tools/bit/make.h
+++ b/tools/bit/make.h
@@ -29,6 +29,8 @@
     vector<string> classes;
     vector<string> paths;
     vector<string> installed;
+
+    bool HasClass(const string& cl);
 };
 
 /**