Fix test naming, and fix tests on windows.

This is a bugfix against my fix for #40133, which has not yet
appeared in 0.3.5.

src/test/test_connection.c

@@ -885,9 +885,9 @@ test_failed_orconn_tracker(void *arg)
 #define CONNECTION_TESTCASE(name, fork, setup)                           \
   { #name, test_conn_##name, fork, &setup, NULL }
 
-/* where arg is an expression (constant, variable, compound expression) */
+/* where arg is a string. */
 #define CONNECTION_TESTCASE_ARG(name, fork, setup, arg)                  \
-  { #name "_" #arg, test_conn_##name, fork, &setup, (void *)arg }
+  { #name "_" arg, test_conn_##name, fork, &setup, (void *)arg }
 
 struct testcase_t connection_tests[] = {
   CONNECTION_TESTCASE(get_basic, TT_FORK, test_conn_get_basic_st),