introduce bb_putchar(). saves ~1800 on uclibc (less on glibc).

diff --git a/networking/nslookup.c b/networking/nslookup.c
index 0036d0d..e5bb56f 100644
--- a/networking/nslookup.c
+++ b/networking/nslookup.c
@@ -112,7 +112,7 @@
 	print_host(server, "Server:");
 	if (ENABLE_FEATURE_CLEAN_UP)
 		free(server);
-	puts("");
+	bb_putchar('\n');
 }
 
 /* alter the global _res nameserver structure to use