use _USE_32BIT_TIME_T in win32 build

Add i2pd.exe in .gitignore

.gitignore

@@ -8,6 +8,7 @@ netDb
 /i2pd
 /libi2pd.a
 /libi2pdclient.a
+i2pd.exe
 
 
 # Autotools

Timestamp.cpp

@@ -5,6 +5,12 @@
 #include "I2PEndian.h"
 #include "Timestamp.h"
 
+#ifdef WIN32
+	#ifndef _WIN64
+		#define _USE_32BIT_TIME_T
+	#endif
+#endif
+
 namespace i2p
 {
 namespace util