contrib: log the command and args for every process installing windows deps stable

contrib: log the command and args for every process installing windows deps

This is a little noisier, but makes it simple to debug when things fail.

Differential Revision: https://phab.mercurial-scm.org/D11272

--- a/contrib/install-windows-dependencies.ps1	Fri Jul 23 10:47:12 2021 +0200
+++ b/contrib/install-windows-dependencies.ps1	Mon Aug 09 19:24:46 2021 -0400
@@ -91,6 +91,8 @@
 }
 
 function Invoke-Process($path, $arguments) {
+    echo "$path $arguments"
+
     $p = Start-Process -FilePath $path -ArgumentList $arguments -Wait -PassThru -WindowStyle Hidden
 
     if ($p.ExitCode -ne 0) {