Update Visual C++ 2013 Redistributable uninstall.

(cherry picked from commit 25c1f81)

Author: pmienk

templates/gsl.appveyor.yml

@@ -93,11 +93,14 @@ endfunction
           | Where-Object { $_.DisplayName -and $_.DisplayName.Contains($product_name) } `
           | Select UninstallString).UninstallString
       }
-      Write-Host "Uninstalling Microsoft Visual C++ 2013 Redistributable (x64)..." -ForegroundColor Yellow;
-      "\$(GetUninstallString "Microsoft Visual C++ 2013 Redistributable (x64)") /quiet" | out-file "$env:TEMP\\uninstall.cmd" -Encoding ASCII;
+      Write-Host "Uninstalling Microsoft Visual C++ 2013 Redistributable (x64) - 12.0.21005..." -ForegroundColor Yellow;
+      "\$(GetUninstallString "Microsoft Visual C++ 2013 Redistributable (x64) - 12.0.21005") /quiet" | out-file "$env:TEMP\\uninstall.cmd" -Encoding ASCII;
       & $env:temp\\uninstall.cmd;
-      Write-Host "Uninstalling Microsoft Visual C++ 2013 Redistributable (x86)..." -Foreground Yellow;
-      "\$(GetUninstallString "Microsoft Visual C++ 2013 Redistributable (x86)") /quiet" | out-file "$env:TEMP\\uninstall.cmd" -Encoding ASCII;
+      Write-Host "Uninstalling Microsoft Visual C++ 2013 Redistributable (x64) - 12.0.30501..." -ForegroundColor Yellow;
+      "\$(GetUninstallString "Microsoft Visual C++ 2013 Redistributable (x64) - 12.0.30501") /quiet" | out-file "$env:TEMP\\uninstall.cmd" -Encoding ASCII;
+      & $env:temp\\uninstall.cmd;
+      Write-Host "Uninstalling Microsoft Visual C++ 2013 Redistributable (x86) - 12.0.30501..." -Foreground Yellow;
+      "\$(GetUninstallString "Microsoft Visual C++ 2013 Redistributable (x86) - 12.0.30501") /quiet" | out-file "$env:TEMP\\uninstall.cmd" -Encoding ASCII;
       & $env:temp\\uninstall.cmd;
       Write-Host "Downloading Visual C++ Compiler November 2013 CTP..." -ForegroundColor Yellow;
       $CTP_INSTALLER_PATH = "\$($env:TEMP)\\$CTP_FILENAME";