Utilities/Release: Add script to build Qt 5.12.1 Windows binaries

These may be used to build CMake binaries for Windows `x86_64` and `i386`.
Qt 5.12.1 supports Windows 7.

Port the logic from `Utilities/Release/win/x86/deps/Dockerfile` and its
helper scripts.

Utilities/Release/README.rst

@@ -91,3 +91,9 @@ macOS
 
 The ``macos/`` directory contains scripts used to produce dependencies
 for building CMake binaries on macOS.
+
+Windows
+-------
+
+The ``win/`` directory contains scripts used to produce dependencies
+for building CMake binaries on Windows.

Utilities/Release/win/qt-5.12.1-win-x86-msvc-install.patch

@@ -0,0 +1,26 @@
+diff --git a/lib/cmake/Qt5Core/Qt5CoreConfig.cmake b/lib/cmake/Qt5Core/Qt5CoreConfig.cmake
+index 04ec302..75d5596 100644
+--- a/lib/cmake/Qt5Core/Qt5CoreConfig.cmake
++++ b/lib/cmake/Qt5Core/Qt5CoreConfig.cmake
+@@ -118,7 +118,7 @@ if (NOT TARGET Qt5::Core)
+     list(REMOVE_DUPLICATES Qt5Core_COMPILE_DEFINITIONS)
+     list(REMOVE_DUPLICATES Qt5Core_EXECUTABLE_COMPILE_FLAGS)
+ 
+-    set(_Qt5Core_LIB_DEPENDENCIES "")
++    set(_Qt5Core_LIB_DEPENDENCIES "${_qt5Core_install_prefix}/lib/qtpcre2.lib;netapi32.lib;version.lib")
+ 
+ 
+     add_library(Qt5::Core STATIC IMPORTED)
+diff --git a/lib/cmake/Qt5Widgets/Qt5WidgetsConfig.cmake b/lib/cmake/Qt5Widgets/Qt5WidgetsConfig.cmake
+index a07b953..2e07371 100644
+--- a/lib/cmake/Qt5Widgets/Qt5WidgetsConfig.cmake
++++ b/lib/cmake/Qt5Widgets/Qt5WidgetsConfig.cmake
+@@ -118,7 +118,7 @@ if (NOT TARGET Qt5::Widgets)
+     list(REMOVE_DUPLICATES Qt5Widgets_COMPILE_DEFINITIONS)
+     list(REMOVE_DUPLICATES Qt5Widgets_EXECUTABLE_COMPILE_FLAGS)
+ 
+-    set(_Qt5Widgets_LIB_DEPENDENCIES "Qt5::Gui;Qt5::Core")
++    set(_Qt5Widgets_LIB_DEPENDENCIES "Qt5::Gui;Qt5::Core;dwmapi.lib;uxtheme.lib")
+ 
+ 
+     add_library(Qt5::Widgets STATIC IMPORTED)

Utilities/Release/win/qt-5.12.1-win-x86-msvc.ps1

@@ -0,0 +1,118 @@
+# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+# Run this script on a Windows host to generate Qt binaries.
+# Set the PATH environment variable to contain the locations of cmake and git.
+
+param (
+  [string]$cmake = 'cmake',
+  [string]$git = 'git',
+  [switch]$trace
+)
+
+if ($trace -eq $true) {
+  Set-PSDebug -Trace 1
+}
+
+$ErrorActionPreference = 'Stop'
+$ProgressPreference = 'SilentlyContinue'
+
+if ($env:VSCMD_ARG_TGT_ARCH -eq "x64") {
+  $arch = "x86_64";
+} elseif ($env:VSCMD_ARG_TGT_ARCH -eq "x86") {
+  $arch = "i386";
+} else {
+  Write-Host "VSCMD_ARG_TGT_ARCH env var not recognized.  Run this from a Visual Studio Command Prompt."
+  exit 1
+}
+
+if ($env:VCToolsVersion -match '^(?<version>[0-9][0-9]\.[0-9])') {
+  $toolset = "msvc_v" + $Matches.version -replace '\.', ''
+} else {
+  Write-Host "VCToolsVersion env var not set.  Run this from a Visual Studio Command Prompt."
+}
+
+$srcname = "qt-everywhere-src-5.12.1"
+$pkgname = "qt-5.12.1-win-$arch-$toolset-1"
+$topdir = $pwd.Path
+$srcdir = Join-Path $topdir $srcname
+$blddir = Join-Path $topdir "$pkgname-build"
+$prefix = Join-Path $topdir $pkgname
+
+# JOM
+if ( -not (Test-Path -Path "jom")) {
+  Invoke-WebRequest -Uri "http://download.qt-project.org/official_releases/jom/unstable-jom.zip" -OutFile jom.zip
+  if ($(Get-FileHash "jom.zip").Hash -ne '128fdd846fe24f8594eed37d1d8929a0ea78df563537c0c1b1861a635013fff8') {
+      exit 1
+  }
+  Expand-Archive -Path jom.zip -DestinationPath jom
+  Remove-Item jom.zip
+}
+$jom = "$topdir\jom\jom.exe"
+
+# Qt Source
+if ( -not (Test-Path -Path $srcdir)) {
+  Invoke-WebRequest -Uri "https://download.qt.io/official_releases/qt/5.12/5.12.1/single/qt-everywhere-src-5.12.1.tar.xz" -OutFile qt.tar.xz
+  if ($(Get-FileHash "qt.tar.xz").Hash -ne 'caffbd625c7bc10ff8c5c7a27dbc7d84fa4de146975c0e1ffe904b514ccd6da4') {
+      exit 1
+  }
+  & $cmake -E tar xvf qt.tar.xz
+  Remove-Item qt.tar.xz
+}
+
+# Build Qt
+if ( -not (Test-Path -Path $blddir)) {
+  New-Item -ItemType Directory -Path $blddir
+  Set-Location -Path "$blddir"
+  & ..\$srcname\configure.bat `
+    -prefix $prefix `
+    -static `
+    -static-runtime `
+    -release `
+    -opensource -confirm-license `
+    -platform win32-msvc `
+    -mp `
+    -gui `
+    -widgets `
+    -qt-pcre `
+    -qt-zlib `
+    -qt-libpng `
+    -qt-libjpeg `
+    -no-gif `
+    -no-icu `
+    -no-pch `
+    -no-angle `
+    -no-opengl `
+    -no-dbus `
+    -no-harfbuzz `
+    -no-accessibility `
+    -skip declarative `
+    -skip multimedia `
+    -skip qtcanvas3d `
+    -skip qtconnectivity `
+    -skip qtdeclarative `
+    -skip qtlocation `
+    -skip qtmultimedia `
+    -skip qtsensors `
+    -skip qtserialport `
+    -skip qtsvg `
+    -skip qtwayland `
+    -skip qtwebchannel `
+    -skip qtwebengine `
+    -skip qtwebsockets `
+    -skip qtxmlpatterns `
+    -nomake examples -nomake tests
+  & $jom -J $env:NUMBER_OF_PROCESSORS
+}
+
+# Install Qt
+if ( -not (Test-Path -Path $prefix)) {
+  & $jom install
+  # Patch the installation.
+  Set-Location -Path $prefix
+  & $git apply -v (Join-Path $PSScriptRoot qt-5.12.1-win-x86-msvc-install.patch)
+}
+
+# Package Qt
+Set-Location -Path $topdir
+& $cmake -E tar cf "$pkgname.zip" "--format=zip" "$pkgname"