xen: update to RELEASE-4.21.0 -tip

This fixes the build against the lastest glibc, and we get a
few other bug fixes as well:

    1c72306b1f domain: move vmtrace_alloc_buffer() invocation in vcpu_create()
    999c6fadf7 vpci/msix: check for BARs enabled in vpci_make_msix_hole
    8f3b637591 x86/ucode: Support discrete modules being CPIO archives
    805e2b8ada x86/pv: Don't assume that INT $imm8 instructions are two bytes long
    93614ffa48 x86/MCE: restore CPU vendor reporting to the outside world
    e10f3ad869 tools/ocaml: fix 32-bit truncation bug in stub_xc_domain_setmaxmem()
    1879637505 tools/sd-notify.h: Include string.h too
    76dc2d6071 systemd: fall back to default system-sleep dir without systemd-devel
    52356ca655 xenstored: Add newline to error message
    4a7d2f18e5 libxl: constify some local variables for building with glibc 2.43
    8061625411 tools/xenstored: fix live update
    6adc1004f7 libxl: Fix device_add QMP calls with QEMU 9.2 and newer
    55bb6db081 xen/cpufreq: fix usages of align_timer() in the on-demand governor
    ae0708e940 xen/cpufreq: fix adjusting of sampling window on early exit
    4778574053 common/domctl: xsm update for get_domain_state access
    615199f05b VT-d: fix off-by-one when handling extra RMRR ranges
    a7380f1437 xen: add non-executable stack note uniformly
    14db25be36 xen/x86: fix usage of [[:blank:]] with BSD grep
    99bd17462d EFI: Fix relocating ESRT for dom0
    afaf4e7b50 SUPPORT.md: extend "lifetime"

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

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