Build: Windows: Improve dependency download speed

Invoke-WebRequest enables a progress bar by default
which slows down the requests a lot. Disabling these makes the build run
much faster.

Source:
- https://stackoverflow.com/a/43477248
- Interactive testing

.github/autobuild/windows.ps1

@@ -39,6 +39,10 @@ param(
 # Fail early on all errors
 $ErrorActionPreference = "Stop"
 
+# Invoke-WebRequest is really slow by default because it renders a progress bar.
+# Disabling this, improves vastly performance:
+$ProgressPreference = 'SilentlyContinue'
+
 $QtDir = 'C:\Qt'
 $ChocoCacheDir = 'C:\ChocoCache'
 $DownloadCacheDir = 'C:\AutobuildCache'

windows/deploy_windows.ps1

@@ -21,6 +21,10 @@ param (
 # Fail early on all errors
 $ErrorActionPreference = "Stop"
 
+# Invoke-WebRequest is really slow by default because it renders a progress bar.
+# Disabling this, improves vastly performance:
+$ProgressPreference = 'SilentlyContinue'
+
 # change directory to the directory above (if needed)
 Set-Location -Path "$PSScriptRoot\..\"