Add several other Cmake warnings.

CMakeLists.txt

@@ -53,6 +53,7 @@ if (WINDOWS)
 endif (WINDOWS)
 
 if (NOT DEFINED CONAN_EXPORTED)
+    MESSAGE(WARNING, "Called from Conan. Not building test build.")
     # Add a definition for the test library
     target_compile_definitions(CreatureLibTests PRIVATE TESTS_BUILD)
 endif ()