- Update requirements for kvm package. Instead of calling qemu-kvm
and Requires: kvm, replace the Requires with /usr/bin/qemu-system-$ARCH
Define the helper for aarch64, ppc64, s390x and x86_64.
Other archs have to use LIBGUESTFS_HV= (bnc#884564)

- Update to version 1.26.5
* generator: Sort the structs.
* Use -v and -x flags consistently across OCaml virt-* tools.
* mllib: Rewrite text wrapping function so it can handle newlines within the text.
* mllib: Add a common 'warning' utility function.
* mllib: Add an interface for Common_utils library.
* mllib: Move common code for comparing version strings to library.
* options: Compile out part of union which cannot be used when not compiling guestfish.
* mllib: Create a common utility function is_directory.
* fuse: UID 0 should override all permissions checks (RHBZ#1106548).
* launch: libvirt: Only use serial BIOS (sgabios) on x86.
* daemon: print parameters for vgchange in error messages
* generator: fix daemon functions with optional params but no mandatory params
* appliance: Increase udev timeout to 6000s (RHBZ#1096579).
* launch: libvirt: Add -device sga (sgabios).

- Add cdrkit-cdrtools-compat, psmisc, gptfdisk, syslinux to
BuildRequires to reduce amount of missing commands

- Include mkinitrd scripts for btrfs, and include it in feature list