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/contrib/51d/src/pattern/51Degrees.h b/contrib/51d/src/pattern/51Degrees.h
index 6a646a6..9aaf949 100644
--- a/contrib/51d/src/pattern/51Degrees.h
+++ b/contrib/51d/src/pattern/51Degrees.h
@@ -24,6 +24,10 @@
 #define FIFTYONEDEGREES_H_PATTERN_INCLUDED
 #endif
 
+#ifndef FIFTYONEDEGREES_DUMMY_LIB
+#define FIFTYONEDEGREES_DUMMY_LIB
+#endif
+
 #include <stdint.h>
 
 typedef enum e_fiftyoneDegrees_MatchMethod {
diff --git a/contrib/51d/src/trie/51Degrees.h b/contrib/51d/src/trie/51Degrees.h
index a5f0868..bedcfd7 100644
--- a/contrib/51d/src/trie/51Degrees.h
+++ b/contrib/51d/src/trie/51Degrees.h
@@ -24,6 +24,10 @@
 #define FIFTYONEDEGREES_H_TRIE_INCLUDED
 #endif
 
+#ifndef FIFTYONEDEGREES_DUMMY_LIB
+#define FIFTYONEDEGREES_DUMMY_LIB
+#endif
+
 #include <stdint.h>
 
 typedef enum e_fiftyoneDegrees_DataSetInitStatus {
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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