Added a check for MySQL client libraries for the connection tests and re-enabled the tests.

server/modules/routing/CMakeLists.txt

@@ -1,3 +1,7 @@
+if(BUILD_TESTS)
+  add_subdirectory(test)
+endif()
+
 add_library(testroute SHARED testroute.c)
 target_link_libraries(testroute log_manager utils)
 install(TARGETS testroute DESTINATION modules)
@@ -16,6 +20,3 @@ install(TARGETS cli DESTINATION modules)
 
 add_subdirectory(readwritesplit)
 
-#if(BUILD_TESTS)
-#  add_subdirectory(test)
-#endif()