Utilities/Release: Add script to build Qt 5.15.2 macOS universal binaries

These may be used to build a CMake universal binary for macOS that supports
both architectures on Apple Silicon and is compatible with OS X 10.13.

Utilities/Release/macos/qt-5.15.2-macosx10.13-x86_64-arm64.bash

@@ -0,0 +1,125 @@
+#!/usr/bin/env bash
+
+# Run this script on a macOS x86_64 host to generate Qt universal binaries.
+#
+# This script requires the 'makeuniversal' tool from:
+#
+#   https://github.com/fizzyade/makeuniversal
+#
+# Build it with an existing local Qt installation first.
+#
+# Set the PATH environment variable to contain the location of 'makeuniversal'.
+
+set -e
+set -x
+
+umask 022
+
+# Verify that 'makeuniversal' is available in the PATH.
+type -p makeuniversal >/dev/null
+
+# Download, verify, and extract sources.
+curl -OL https://download.qt.io/archive/qt/5.15/5.15.2/single/qt-everywhere-src-5.15.2.tar.xz
+shasum -a 256 qt-everywhere-src-5.15.2.tar.xz | grep -q 3a530d1b243b5dec00bc54937455471aaa3e56849d2593edb8ded07228202240
+tar xjf qt-everywhere-src-5.15.2.tar.xz
+
+# Build the x86_64 variant.
+mkdir qt-5.15.2-x86_64
+cd qt-5.15.2-x86_64
+../qt-everywhere-src-5.15.2/configure \
+  --prefix=/ \
+  -platform macx-clang \
+  -device-option QMAKE_APPLE_DEVICE_ARCHS=x86_64 \
+  -device-option QMAKE_MACOSX_DEPLOYMENT_TARGET=10.13 \
+  -release \
+  -opensource -confirm-license \
+  -gui \
+  -widgets \
+  -no-gif \
+  -no-icu \
+  -no-pch \
+  -no-angle \
+  -no-opengl \
+  -no-dbus \
+  -no-harfbuzz \
+  -skip declarative \
+  -skip multimedia \
+  -skip qtcanvas3d \
+  -skip qtcharts \
+  -skip qtconnectivity \
+  -skip qtdeclarative \
+  -skip qtgamepad \
+  -skip qtlocation \
+  -skip qtmultimedia \
+  -skip qtnetworkauth \
+  -skip qtpurchasing \
+  -skip qtremoteobjects \
+  -skip qtscript \
+  -skip qtsensors \
+  -skip qtserialbus \
+  -skip qtserialport \
+  -skip qtsvg \
+  -skip qtwebchannel \
+  -skip qtwebengine \
+  -skip qtwebsockets \
+  -skip qtxmlpatterns \
+  -nomake examples \
+  -nomake tests \
+  -nomake tools
+make -j 8
+cd ..
+
+# Build the arm64 variant.
+mkdir qt-5.15.2-arm64
+cd qt-5.15.2-arm64
+../qt-everywhere-src-5.15.2/configure \
+  --prefix=/ \
+  -platform macx-clang \
+  -device-option QMAKE_APPLE_DEVICE_ARCHS=arm64 \
+  -device-option QMAKE_MACOSX_DEPLOYMENT_TARGET=10.13 \
+  -release \
+  -opensource -confirm-license \
+  -gui \
+  -widgets \
+  -no-gif \
+  -no-icu \
+  -no-pch \
+  -no-angle \
+  -no-opengl \
+  -no-dbus \
+  -no-harfbuzz \
+  -skip declarative \
+  -skip multimedia \
+  -skip qtcanvas3d \
+  -skip qtcharts \
+  -skip qtconnectivity \
+  -skip qtdeclarative \
+  -skip qtgamepad \
+  -skip qtlocation \
+  -skip qtmultimedia \
+  -skip qtnetworkauth \
+  -skip qtpurchasing \
+  -skip qtremoteobjects \
+  -skip qtscript \
+  -skip qtsensors \
+  -skip qtserialbus \
+  -skip qtserialport \
+  -skip qtsvg \
+  -skip qtwebchannel \
+  -skip qtwebengine \
+  -skip qtwebsockets \
+  -skip qtxmlpatterns \
+  -nomake examples \
+  -nomake tests \
+  -nomake tools
+make -j 8 -k
+cd ..
+
+# Combine the two builds into universal binaries.
+makeuniversal qt-5.15.2-univ qt-5.15.2-x86_64 qt-5.15.2-arm64
+cd qt-5.15.2-univ
+make install -j 8 INSTALL_ROOT=/tmp/qt-5.15.2-macosx10.13-x86_64-arm64
+cd ..
+
+# Create the final tarball containing universal binaries.
+tar cjf qt-5.15.2-macosx10.13-x86_64-arm64.tar.xz -C /tmp qt-5.15.2-macosx10.13-x86_64-arm64