Fix a few warnings on windows

obs/obs-app.cpp

@@ -71,9 +71,9 @@ static void do_log(int log_level, const char *msg, va_list args, void *param)
 {
 	fstream &logFile = *static_cast<fstream*>(param);
 	char str[4096];
-	va_list args2;
 
 #ifndef _WIN32
+	va_list args2;
 	va_copy(args2, args);
 #endif
 

obs/window-basic-main.cpp

@@ -1289,7 +1289,7 @@ void OBSBasic::UploadLog(const char *file)
 
 	jsonData = std::move(ss.str());
 
-	logUploadPostData.setData(jsonData.c_str(), jsonData.size());
+	logUploadPostData.setData(jsonData.c_str(), (int)jsonData.size());
 
 	QUrl url("https://api.github.com/gists");
 	logUploadReply = networkManager.post(QNetworkRequest(url),