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

ports/emacs/emacs_pepper.c

Index: ports/emacs/emacs_pepper.c
diff --git a/ports/emacs/emacs_pepper.c b/ports/emacs/emacs_pepper.c
index 0a22e50ea53a5290e3af08f337d3b92ba07128b9..6f2efcc6d1137854d07ea138991cc105f1ee6ed3 100644
--- a/ports/emacs/emacs_pepper.c
+++ b/ports/emacs/emacs_pepper.c
@@ -57,7 +57,7 @@ char* whatis(Lisp_Object object) {
 // The special NaCl entry point into emacs.
 extern int nacl_emacs_main(int argc, char* argv[]);
 
-int nacl_main(int argc, char* argv[]) {
+int main(int argc, char* argv[]) {
   if (nacl_startup_untar(argv[0], "emacs.tar", "/"))
     return 1;
   return nacl_emacs_main(argc, argv);