Merge remote-tracking branch 'origin/5.6' into 5.9

42b502f is not needed for branches >= 5.8, configure.exe does not
exist anymore.

30660bf was not applied to 5.9 branch, the scripts were not
adapted to new template.

 Conflicts:
	coin/platform_configs/default.txt
	coin/platform_configs/qt5.txt

Change-Id: Ie3681d5f641e99a074368f21b7f85fe31beacc17

coin/provisioning/common/helpers.ps1

@@ -92,6 +92,7 @@ function Download
         [string] $CachedUrl   = $(BadParam("the locally cached URL")),
         [string] $Destination = $(BadParam("a download target location"))
     )
+    $ProgressPreference = 'SilentlyContinue'
     try {
         if ($CachedUrl.StartsWith("http")) {
             Invoke-WebRequest -UseBasicParsing $CachedUrl -OutFile $Destination
@@ -109,5 +110,17 @@ function Add-Path
         [string]$Path
     )
     echo "Adding $Path to Path"
-    [Environment]::SetEnvironmentVariable("Path", $env:Path + ";$Path", [EnvironmentVariableTarget]::Machine)
+
+    $oldPath = [System.Environment]::GetEnvironmentVariable('Path', 'Machine')
+    [Environment]::SetEnvironmentVariable("Path", $oldPath + ";$Path", [EnvironmentVariableTarget]::Machine)
+}
+
+function is64bitWinHost
+{
+    if(($env:PROCESSOR_ARCHITECTURE -eq "AMD64") -or ($env:PROCESSOR_ARCHITEW6432 -eq "AMD64")) {
+        return 1
+    }
+    else {
+        return 0
+    }
 }