update boost toolset and notes, remove BOOST_ROOT

images/win/scripts/Installers/Validate-ToolCache.ps1

@@ -63,6 +63,78 @@ function RunTestsByPath {
     }
 }
 
+function Get-SystemDefaultPython {
+    Write-Host "Validate system Python..."
+
+    if (Get-Command -Name 'python')
+    {
+        Write-Host "Python $(& python -V 2>&1) on path"
+    }
+    else
+    {
+        Write-Host "Python is not on path"
+        exit 1
+    }
+
+    $pythonBinVersion = $(& python -V 2>&1)
+    if ($pythonBinVersion -notlike "Python 3.*")
+    {
+        Write-Error "Python 3 is not in the PATH"
+        exit 1
+    }
+
+    $pythonBinOnPath = Split-Path -Path (Get-Command -Name 'python').Path
+    $description = GetDefaultToolDescription -SoftwareVersion $pythonBinVersion -SoftwareLocation $pythonBinOnPath
+
+    return $description
+}
+
+function Get-SystemDefaultRuby {
+    Write-Host "Validate system Ruby..."
+
+    if (Get-Command -Name 'ruby')
+    {
+        Write-Host "$(ruby --version) is on the path."
+    }
+    else
+    {
+        Write-Host "Ruby is not on the path."
+        exit 1
+    }
+
+    $rubyBinOnPath = Split-Path -Path (Get-Command -Name 'ruby').Path
+    if ( $(ruby --version) -notmatch 'ruby (?<version>.*) \(.*' )
+    {
+        Write-Host "Unable to determine Ruby version at " + $rubyBinOnPath
+        exit 1
+
+    }
+
+    $rubyVersionOnPath = "Ruby $($Matches.version)"
+    $description = GetDefaultToolDescription -SoftwareVersion $rubyVersionOnPath -SoftwareLocation $rubyBinOnPath
+
+    $gemVersion = & gem -v
+    $description += "* Gem Version: $gemVersion<br/>"
+
+    return $description
+}
+
+function GetDefaultToolDescription {
+    param (
+        [Parameter(Mandatory = $True)]
+        [string]$SoftwareVersion,
+        [Parameter(Mandatory = $True)]
+        [string]$SoftwareLocation
+    )
+
+    $description = "<br/>__System default version:__ $SoftwareVersion<br/>"
+    $description += "_Environment:_<br/>"
+    $description += "* Location: $SoftwareLocation<br/>"
+    $description += "* PATH: contains the location of $SoftwareVersion<br/>"
+
+    return $description
+}
+
 function GetMarkdownDescription {
     param (
         [Parameter(Mandatory = $True)]
@@ -123,6 +195,14 @@ function ToolcacheTest {
             $markdownDescription += GetMarkdownDescription -SoftwareVersion $foundVersion -SoftwareArchitecture $requiredArchitecture
         }
     }
+
+    if ($SoftwareName -contains "Python") {
+        $markdownDescription += Get-SystemDefaultPython
+    }
+    if ($SoftwareName -contains "Ruby") {
+        $markdownDescription += Get-SystemDefaultRuby
+    }
+
     Add-SoftwareDetailsToMarkdown -SoftwareName $SoftwareName -DescriptionMarkdown $markdownDescription
 }