More fixes for Windows support

src/VirtualTap.cpp

@@ -84,6 +84,7 @@ namespace ZeroTier {
 			_handler(handler),
 			_homePath(homePath),
 			_arg(arg),
+			_initialized(false),
 			_enabled(true),
 			_run(true),
 			_mac(mac),

src/VirtualTap.hpp

@@ -206,6 +206,7 @@ namespace ZeroTier {
 
 		std::string _homePath;
 		void *_arg;
+		volatile bool _initialized;
 		volatile bool _enabled;
 		volatile bool _run;
 		MAC _mac;