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

ports/curl/nacl.patch

 diff --git a/lib/hostip4.c b/lib/hostip4.c
 --- a/lib/hostip4.c
 +++ b/lib/hostip4.c
 @@ -115,6 +115,12 @@ Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
  
  #if defined(CURLRES_IPV4) && !defined(CURLRES_ARES)
  
 +#ifdef __native_client__
 +// nacl_io does not yet support gethostbyname_r().
 +// TODO(sbc): remove this once it is added to nacl_io: http://crbug.com/387474
 +#undef HAVE_GETHOSTBYNAME_R
 +#endif
 +
  /*
   * Curl_ipv4_resolve_r() - ipv4 threadsafe resolver function.
   *
 diff --git a/src/Makefile.in b/src/Makefile.in
 --- a/src/Makefile.in
 +++ b/src/Makefile.in
 @@ -749,7 +749,7 @@ clean-binPROGRAMS:
  
  curl$(EXEEXT): $(curl_OBJECTS) $(curl_DEPENDENCIES) $(EXTRA_curl_DEPENDENCIES) 
         @rm -f curl$(EXEEXT)
 -       $(AM_V_CCLD)$(curl_LINK) $(curl_OBJECTS) $(curl_LDADD) $(LIBS)
 +       $(AM_V_CCLD)$(curl_LINK) $(curl_OBJECTS) $(curl_LDADD) $(LIBS) $(EXTRA_LIBS)
  
  mostlyclean-compile:
         -rm -f *.$(OBJEXT)
-diff --git a/src/tool_main.c b/src/tool_main.c
---- a/src/tool_main.c
-+++ b/src/tool_main.c
-@@ -213,6 +213,10 @@ static void main_free(struct GlobalConfig *config)
-   config->last = NULL;
- }
- 
-+#ifdef __native_client__
-+#define main nacl_main
-+#endif
-+
- /*
- ** curl tool main function.
- */