Switch from using 'nacl_main' to 'main' entry point

ports/nethack/nethack_pepper.c

Index: ports/nethack/nethack_pepper.c
diff --git a/ports/nethack/nethack_pepper.c b/ports/nethack/nethack_pepper.c
index 06cdc0df7e5e3cc7c480df8621e534e4bdce9d1e..8b07bc5f61750d303328e2eea306094b28ba7b52 100644
--- a/ports/nethack/nethack_pepper.c
+++ b/ports/nethack/nethack_pepper.c
@@ -43,7 +43,7 @@ static void setup_unix_environment(const char* arg0) {
   }
 }
 
-int nacl_main(int argc, char* argv[]) {
+int main(int argc, char* argv[]) {
   setup_unix_environment(argv[0]);
   return nethack_main(argc, argv);
 }