Add libvirt

[bartsdev]

Adds libvirt 12.2.0 (the de-facto-standard virtualisation API) as a new
Wolfi package, plus the conventional -libs, -dev, and -doc subpackages.

Fixes: wolfi-dev/os#

Related: https://release-monitoring.org/project/13830/

Summary

• Upstream: https://libvirt.org/ — actively maintained, regular releases
• License: LGPL-2.1-or-later (OSI-approved)
• Subpackages produced: libvirt-libs, libvirt-dev, libvirt-doc
• Builds via: make package/libvirt on aarch64 + x86_64
• Auto-bumps via release-monitor identifier 13830

Build configuration notes

• driver_qemu=enabled, driver_libvirtd=enabled — the runtime drivers most
  Wolfi consumers will want; lxc, polkit, apparmor, selinux,
  storage_mpath are disabled to keep the dependency footprint minimal.
• checks.disabled: [tempdir] — libvirt's install honours DESTDIR but
  also writes under the configure-time --localstatedir path, which the
  default tempdir check flags. Comment in the YAML explains this.

Pre-review Checklist

For version bump PRs

• The epoch field is reset to 0 (new package, starting at epoch 0)

CVE Scanning: This PR will fail if ANY CVEs are found (fail-any mode).