[PATCH 0/8] refresh nixpkgs for Linux 7.1

[colbyt <colby@colbyt.com>]

This series moves the default nixpkgs pin forward and fixes the build
and runtime issues exposed on the generic Spectrum path. It lets the
generic images follow linux_latest, which currently selects Linux 7.1.1.

The changes are split by cause: aarch64-musl build fixes exposed by the
pin bump, integrated skaware and GTK backports, Cloud Hypervisor 52.0
with the local vhost-user GPU patchset rebased, the libfyaml pkg-config
cleanup needed by AppStream, and the app VM closure-root fix for foot
and Firefox.

The Cloud Hypervisor update includes the crosvm SHMEM_MAP compatibility
needed by the current crosvm GPU backend.

I am also sending one optional follow-up patch that keeps the generic
images on linux_6_18 instead. It is the same code path plus a small
kernel package selection patch, and updates the conservative LTS track
from Linux 6.18.2 to the 6.18.36 package from the new nixpkgs pin. That
variant passed the full integration suite on Linux 6.18.36.

Tested on aarch64 with nix-portable:
- cloud-hypervisor package build and cargo checks
- full integration suite: late-serial, appimage, networking, portal on
  Linux 7.1.1

colbyt (8):
  pkgs: fix aarch64-musl builds with current nixpkgs
  lib: update nixpkgs
  pkgs/skaware: vendor backported patches
  pkgs/gtk3: skip integrated Wayland backport
  pkgs/skaware: skip integrated backports
  pkgs/cloud-hypervisor: update GPU patchset to v52
  pkgs/libfyaml: fix pkg-config libs
  vm-lib: allow app VMs to name closure roots

 lib/nixpkgs.default.nix                       |   4 +-
 .../0001-build-use-local-vhost.patch          |  38 +-
 ...0002-virtio-devices-add-a-GPU-device.patch | 684 ++++++++----------
 pkgs/cloud-hypervisor/default.nix             |  77 +-
 ...ost_user-add-crosvm-shmem-map-compat.patch |  79 ++
 pkgs/gtk3/default.nix                         |   4 +-
 pkgs/overlay.nix                              | 112 +++
 ...d-don-t-chmod-device-nodes-for-lines.patch |  10 +
 ...limit-add-p-option-for-rlimit-rtprio.patch |  25 +
 pkgs/skaware-packages/default.nix             |  20 +-
 vm-lib/make-vm.nix                            |   4 +-
 vm/app/firefox.nix                            |   1 +
 vm/app/foot.nix                               |   1 +
 13 files changed, 645 insertions(+), 414 deletions(-)
 create mode 100644 pkgs/cloud-hypervisor/vhost/0003-vhost_user-add-crosvm-shmem-map-compat.patch
 create mode 100644 pkgs/skaware-packages/0001-mdevd-don-t-chmod-device-nodes-for-lines.patch
 create mode 100644 pkgs/skaware-packages/0001-s6-softlimit-add-p-option-for-rlimit-rtprio.patch

-- 
2.54.0