httpd.h: added C++ guards

apps/httpserver_raw/httpd.h

@@ -40,6 +40,9 @@
 #include "lwip/err.h"
 #include "lwip/pbuf.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
 
 /** Set this to 1 to support CGI */
 #ifndef LWIP_HTTPD_CGI
@@ -233,4 +236,9 @@ void httpd_post_data_recved(void *connection, u16_t recved_len);
 
 void httpd_init(void);
 
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* LWIP_HTTPD_H */