Merged in masayuki2009/nuttx.apps/fix_helloxx (pull request #144)

apps/examples/helloxx: Add main() for CONFIG_BUILD_KERNEL

Signed-off-by: Masayuki Ishikawa <masayuki.ishikawa@gmail.com>

Approved-by: GregoryN <gnutt@nuttx.org>

examples/helloxx/helloxx_main.cxx

@@ -127,7 +127,11 @@ static CHelloWorld g_HelloWorld;
 
 extern "C"
 {
+#ifdef CONFIG_BUILD_KERNEL
+  int main(int argc, FAR char *argv[])
+#else
   int helloxx_main(int argc, char *argv[])
+#endif
  {
     // If C++ initialization for static constructors is supported, then do
     // that first