Fixed compilation errors for x86_64

Author: danielga

source/netmessages.cpp

@@ -227,7 +227,7 @@ namespace NetMessages
 		{
 			ClassName *msg = CheckNetmessageType<ClassName>( LUA );
 
-			size_t len = 0;
+			unsigned int len = 0;
 			const char *data = LUA->GetString( 2, &len );
 			std::memcpy(
 				reinterpret_cast<void *>( msg->*M ), data, MaximumLength < len ? MaximumLength : len

source/networkstringtable.cpp

@@ -119,7 +119,7 @@ namespace NetworkStringTable
 		LUA->CheckType( 2, GarrysMod::Lua::Type::BOOL );
 		LUA->CheckType( 3, GarrysMod::Lua::Type::STRING );
 
-		size_t len = 0;
+		unsigned int len = 0;
 		const char *UserData = nullptr;
 		if( LUA->IsType( 4, GarrysMod::Lua::Type::STRING ) )
 			UserData = LUA->GetString( 4, &len );