Provisioning: Install Ninja on windows hosts used to build cmake-based QtWebKit

Makefile-based generators of CMake are much less efficient than Ninja. They
generate bloated Makefiles that call back to cmake often. Main offender on
Windows is cmake_depends command which seems to do lots of disk reads.

QtWebKit can now switch to ninja automatically if it's present in PATH.
This should help to reduce build times.

Change-Id: I33d3f4d766a630f8ca4fb64b719fe2e8a5c2e00c
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

coin/provisioning/common/ninja.ps1

@@ -0,0 +1,12 @@
+. "$PSScriptRoot\helpers.ps1"
+
+$zip = "c:\users\qt\downloads\ninja-1.6.0-win-x86.zip"
+
+Download https://github.com/ninja-build/ninja/releases/download/v1.6.0/ninja-win.zip \\ci-files01-hki.ci.local\provisioning\ninja\ninja-1.6.0-win-x86.zip $zip
+Verify-Checksum $zip "E01093F6533818425F8EFB0843CED7DCAABEA3B2"
+
+Extract-Zip $zip C:\Utils\Ninja
+Remove-Item $zip
+
+$machinePath = [Environment]::GetEnvironmentVariable('Path', [EnvironmentVariableTarget]::Machine)
+[Environment]::SetEnvironmentVariable("Path", $machinePath + ";C:\Utils\Ninja", [EnvironmentVariableTarget]::Machine)

coin/provisioning/qtci-windows-10-x86/06-ninja.ps1

@@ -0,0 +1 @@
+. "$PSScriptRoot\..\common\ninja.ps1"

coin/provisioning/qtci-windows-10-x86_64/06-ninja.ps1

@@ -0,0 +1 @@
+. "$PSScriptRoot\..\common\ninja.ps1"

coin/provisioning/qtci-windows-7-x86/08-ninja.ps1

@@ -0,0 +1 @@
+. "$PSScriptRoot\..\common\ninja.ps1"