Force doctest to flush each message to stdout.

lewissbaker · Lewis Baker · commit 447a6e69b5fb · 2018-01-08T11:17:20.000+10:30
This should avoid missing messages due to buffering should the
process crash soon after a message was written.
diff --git a/test/doctest/doctest.h b/test/doctest/doctest.h
@@ -5036,6 +5036,8 @@ namespace doctest
 			DOCTEST_PRINTF_COLORED(context.c_str(), Color::None);
 			DOCTEST_PRINTF_COLORED("\n", Color::None);
 
+			std::fflush(stdout);
+
 			printToDebugConsole(String(loc) + msg + "  " + info.c_str() + "\n" + context.c_str() +
 				"\n");
 
