unit-tests: Disable AddressSanitizer for threading cleanup function

As the cleanup function reads from the correct address on the parent frame,
it is currently unclear why AddressSanitizer complains about that pointer
dereference.

src/libstrongswan/tests/suites/test_threading.c

@@ -1214,6 +1214,8 @@ START_TEST(test_cancel_point)
 }
 END_TEST
 
+/* not sure why AddressSanitizer complains here, pointer looks fine */
+ADDRESS_SANITIZER_EXCLUDE
 static void close_fd_ptr(void *fd)
 {
 	close(*(int*)fd);
@@ -1253,6 +1255,8 @@ static void cancellation_read()
 	}
 }
 
+/* the AddressSaniziter complains about the fd_set here for some reason */
+ADDRESS_SANITIZER_EXCLUDE
 static void cancellation_select()
 {
 	int sv[2];