As this script is now also used in GLib, unify the formatting between
GLib and GTK. Make the formatting of the script conformant to the
Black[1] tool, as GLib requires, and add a copyright header to this
script.
[1]: https://black.readthedocs.io/en/stable/, see also
$(glibsrcroot)/.gitlab-ci/run-bash.sh
The resource compiler in the Windows 11 SDK does not allow one to include
winuser.h directly in resource scripts (.rc) with a rather cryptic error
message, so fix generating the .rc file to embed the UAC manifest by including
windows.h with WIN32_LEAN_AND_MEAN instead.
As the program executable name has 'update' in its filename,
gtk4-update-icon-cache.exe is considered to be an installer program on 32-bit
Windows [1], which will cause the program to fail to run unless it is running
with elevated privileges (i.e. UAC).
Avoid this situation by embedding a manifest file into the final executable
that tells Windows that this is not a program that requires elevation.
Fixes issue #3632.
[1]: https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-vista/cc709628(v=ws.10)?redirectedfrom=MSDN,
under section "Installer Detection Technology"
