BUILD/MINOR: 51d: Updated build registration output to indicate thatif the library is a dummy one or not.

When built with the dummy 51Degrees library for testing, the output will
include "(dummy library)" to ensure it is clear that this is this is not
the API.
diff --git a/src/51d.c b/src/51d.c
index bf40658..344be41 100644
--- a/src/51d.c
+++ b/src/51d.c
@@ -827,4 +827,17 @@
 
 REGISTER_POST_CHECK(init_51degrees);
 REGISTER_POST_DEINIT(deinit_51degrees);
-REGISTER_BUILD_OPTS("Built with 51Degrees support.");
+
+#if defined(FIFTYONEDEGREES_H_PATTERN_INCLUDED)
+#ifndef FIFTYONEDEGREES_DUMMY_LIB
+	REGISTER_BUILD_OPTS("Built with 51Degrees Pattern support.");
+#else
+	REGISTER_BUILD_OPTS("Built with 51Degrees Pattern support (dummy library).");
+#endif
+#elif defined(FIFTYONEDEGREES_H_TRIE_INCLUDED)
+#ifndef FIFTYONEDEGREES_DUMMY_LIB
+	REGISTER_BUILD_OPTS("Built with 51Degrees Trie support.");
+#else
+	REGISTER_BUILD_OPTS("Built with 51Degrees Trie support (dummy library).");
+#endif
+#endif
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