CI: use verbose mode during the CI runs

Enable verbose mode execution for the build script in the hopes that we
can catch the issue that is preventing the builds on new hosts.

Author: compnerd

utils/build-windows.bat

@@ -21,7 +21,7 @@
 :: The user will need permission to write files into the Windows SDK and the
 :: VisualC++ folder.
 
-@echo off
+:: @echo off
 
 setlocal enableextensions enabledelayedexpansion