+ tests: avoid some compiler warnings
+ * tests/test-getaddrinfo.c (simple): Mark static, and allow string
+ literals.
+ * tests/test-memchr.c (main): Avoid type mismatch.
+ * tests/test-arpa_inet.c (main): Avoid unused parameters.
+ * tests/test-base64.c (main): Likewise.
+ * tests/test-getdelim.c (main): Likewise.
+ * tests/test-gethostname.c (main): Likewise.
+ * tests/test-getline.c (main): Likewise.
+ * tests/test-netinet_in.c (main): Likewise.
+ * tests/test-select.c (open_server_socket, main): Likewise.
+ * tests/test-select-stdin.c (main): Likewise.
+ * tests/test-sockets.c (main): Likewise.
+ * tests/test-strsignal.c (main): Likewise.
+ * tests/test-sys_select.c (main): Likewise.
+ * tests/test-sys_socket.c (main): Likewise.
+ * tests/test-u64.c (main): Likewise.
+ * tests/test-xfprintf-posix.c (main): Likewise.
+ * tests/test-xvasprintf.c (test_xvasprintf, main): Likewise.
+