NaCl: Don't try to use CSD, vsyslog, or setgroups

NaCl doesn't currently support forking, syslog, or user identities.
There are stub functions under glibc, but not under newlib.  This
patch allows building openconnect with either libc.

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

auth.c

@@ -968,9 +968,9 @@ static int fetch_config(struct openconnect_info *vpninfo)
 
 static int run_csd_script(struct openconnect_info *vpninfo, char *buf, int buflen)
 {
-#ifdef _WIN32
+#if defined(_WIN32) || defined(__native_client__)
 	vpn_progress(vpninfo, PRG_ERR,
-		     _("Error: Running the 'Cisco Secure Desktop' trojan on Windows is not yet implemented.\n"));
+		     _("Error: Running the 'Cisco Secure Desktop' trojan on this platform is not yet implemented.\n"));
 	return -EPERM;
 #else
 	char fname[64];
@@ -1167,7 +1167,7 @@ static int run_csd_script(struct openconnect_info *vpninfo, char *buf, int bufle
 
 	http_add_cookie(vpninfo, "sdesktop", vpninfo->csd_token, 1);
 	return 0;
-#endif /* !_WIN32 */
+#endif /* !_WIN32 && !__native_client__ */
 }
 
 

main.c

@@ -123,12 +123,12 @@ static void __attribute__ ((format(printf, 3, 4)))
 	}
 }
 #define openlog(...)  /* */
-#elif defined(_WIN32)
+#elif defined(_WIN32) || defined(__native_client__)
 /*
  * FIXME: Perhaps we could implement syslog_progress() using these APIs:
  * http://msdn.microsoft.com/en-us/library/windows/desktop/aa364148%28v=vs.85%29.aspx
  */
-#else /* !__ANDROID__ && !_WIN32 */
+#else /* !__ANDROID__ && !_WIN32 && !__native_client__ */
 #include <syslog.h>
 static void  __attribute__ ((format(printf, 3, 4)))
     syslog_progress(void *_vpninfo, int level, const char *fmt, ...)
@@ -1414,12 +1414,14 @@ int main(int argc, char **argv)
 	if (proxy && openconnect_set_http_proxy(vpninfo, strdup(proxy)))
 		exit(1);
 
-#ifndef _WIN32
+#if !defined(_WIN32) && !defined(__native_client__)
 	if (use_syslog) {
 		openlog("openconnect", LOG_PID, LOG_DAEMON);
 		vpninfo->progress = syslog_progress;
 	}
+#endif /* !_WIN32 && !__native_client__ */
 
+#ifndef _WIN32
 	memset(&sa, 0, sizeof(sa));
 
 	sa.sa_handler = handle_signal;

mainloop.c

@@ -125,7 +125,7 @@ static int setup_tun_device(struct openconnect_info *vpninfo)
 		return ret;
 	}
 
-#ifndef _WIN32
+#if !defined(_WIN32) && !defined(__native_client__)
 	if (vpninfo->uid != getuid()) {
 		int e;