ensure liburing is only pulled in by suggested libs when glibc >= 2.30 (or musl)

src/SPC/util/SPCTarget.php

@@ -100,6 +100,10 @@ class SPCTarget
     public static function getLibcVersion(): ?string
     {
         if (PHP_OS_FAMILY === 'Linux') {
+            $target = getenv('SPC_TARGET');
+            if (str_contains($target, '-gnu.2.')) {
+                return preg_match('/-gnu\.(2\.\d+)/', $target, $matches) ? $matches[1] : null;
+            }
             $libc = self::getLibc();
             return SystemUtil::getLibcVersionIfExists($libc);
         }