Avoid libxml_entity_loader errors on PHP8+

[solracsf]

Check against PHP version instead of LIBXML version.
Same fix as https://github.com/nextcloud/server/blob/master/lib/private/App/InfoParser.php#L64

"url": "/settings/admin/overview",
  "message": "Function libxml_disable_entity_loader() is deprecated at /app/lib/private/Updater/VersionCheck.php#100",
  "userAgent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.5005.115 Safari/537.36",
  "version": "23.0.6.1",
  "exception": {
    "Exception": "Error",
    "Message": "Function libxml_disable_entity_loader() is deprecated at /app/lib/private/Updater/VersionCheck.php#100",
    "Code": 0,
    "Trace": [
      {
        "file": "/app/lib/private/Updater/VersionCheck.php",
        "line": 100,
        "function": "onError",
        "class": "OC\\Log\\ErrorHandler",
        "type": "::",
        "args": [
          8192,
          "Function libxml_disable_entity_loader() is deprecated",
          "/app/lib/private/Updater/VersionCheck.php",
          100
        ]
      },

[solracsf]

/backport to stable24

[solracsf]

/backport to stable23

[solracsf]

/backport to stable22

[kesselb]

Hi,

Afaik the check against libxml is better because older php versions may use a newer libxml version too: c3a1a66 / sabre-io/xml#204

"version": "23.0.6.1",

That's the problem. I don't think we backported this fix to 23.

[solracsf]

Oh, i see. I'll try to backport the portable commits of that large PR :)