test: convert message_types to gtest

Change-Id: Ifb5d2b9f4cb5c6700f5c0164466cc5289ee40a26
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/test/Makefile.am b/test/Makefile.am
index e064504..af70c63 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -25,6 +25,7 @@
 
 check_PROGRAMS += message_types
 message_types_SOURCES = message/types.cpp
+message_types_LDFLAGS = $(gtest_ldflags)
 
 check_PROGRAMS += utility_tuple_to_array
 utility_tuple_to_array_SOURCES = utility/tuple_to_array.cpp