Fix linux build

httpserver/httpserver-private.h

@@ -19,6 +19,7 @@
 #include <time.h>
 #include <functional>
 #include <assert.h>
+#include <string.h>
 #include "../webui.h"
 
 using namespace std;

processor/processor-private.h

@@ -16,6 +16,7 @@
 #include <unistd.h>
 #include <functional>
 #include <assert.h>
+#include <string.h>
 #include "../thirdparty/configor/json.hpp"
 
 #include "../utils/utils.h"

utils/utils-private.h

@@ -14,6 +14,7 @@
 #include <fstream>
 #include <functional>
 #include <assert.h>
+#include <string.h>
 
 using namespace std;