Do not build selftest.c when running relay mode is disabled.

changes/ticket33370

@@ -0,0 +1,3 @@
+  o Minor features (client-only compilation):
+    - Disable more of our self-testing code when support for relay mode is
+      disabled. Closes ticket 33370.

src/feature/relay/include.am

@@ -5,8 +5,7 @@ LIBTOR_APP_A_SOURCES += 			\
 	src/feature/relay/ext_orport.c		\
 	src/feature/relay/onion_queue.c		\
 	src/feature/relay/router.c		\
-	src/feature/relay/routerkeys.c		\
-	src/feature/relay/selftest.c
+	src/feature/relay/routerkeys.c
 
 # The Relay module.
 
@@ -16,6 +15,7 @@ MODULE_RELAY_SOURCES = 						\
 	src/feature/relay/relay_config.c			\
 	src/feature/relay/relay_periodic.c			\
 	src/feature/relay/relay_sys.c				\
+	src/feature/relay/selftest.c				\
 	src/feature/relay/transport_config.c
 
 # ADD_C_FILE: INSERT HEADERS HERE.

src/feature/relay/selftest.h

@@ -12,6 +12,7 @@
 #ifndef TOR_SELFTEST_H
 #define TOR_SELFTEST_H
 
+#ifdef HAVE_MODULE_RELAY
 struct or_options_t;
 int check_whether_orport_reachable(const struct or_options_t *options);
 int check_whether_dirport_reachable(const struct or_options_t *options);
@@ -20,5 +21,33 @@ void router_do_reachability_checks(int test_or, int test_dir);
 void router_orport_found_reachable(void);
 void router_dirport_found_reachable(void);
 void router_perform_bandwidth_test(int num_circs, time_t now);
+#else /* !defined(HAVE_MODULE_RELAY) */
+
+#define check_whether_orport_reachable(opts) \
+  ((void)(opts), 0)
+#define check_whether_dirport_reachable(opts) \
+  ((void)(opts), 0)
+
+#define router_orport_found_reachable() \
+  STMT_NIL
+#define router_dirport_found_reachable() \
+  STMT_NIL
+
+static inline void
+router_do_reachability_checks(int test_or, int test_dir)
+{
+  (void)test_or;
+  (void)test_dir;
+  tor_assert_nonfatal_unreached();
+}
+static inline void
+router_perform_bandwidth_test(int num_circs, time_t now)
+{
+  (void)num_circs;
+  (void)now;
+  tor_assert_nonfatal_unreached();
+}
+
+#endif /* defined(HAVE_MODULE_RELAY) */
 
 #endif /* !defined(TOR_SELFTEST_H) */