Add patch for pcntl extension.

Author: drupol

pkgs/package-overrides.nix

@@ -160,6 +160,19 @@ in
         ];
     });
 
+    pcntl = prev.extensions.pcntl.overrideAttrs (attrs: {
+      patches =
+        attrs.patches or []
+        ++ lib.optionals (lib.versionAtLeast prev.php.version "8.2") [
+          # Fix pcntl builds
+          # More info at https://github.com/php/php-src/pull/9284
+          (pkgs.fetchpatch {
+            url = "https://github.com/php/php-src/commit/20f4f84274f939d5f061bb1fccd23ce563ece6d0.patch";
+            sha256 = "PJrV69RUBG9xSKLm8sffIp8WgsmxWLtK2iLQFWCjmXQ=";
+          })
+        ];
+    });
+
     intl = prev.extensions.intl.overrideAttrs (attrs: {
       doCheck = if lib.versionOlder prev.php.version "7.2" then false else attrs.doCheck or true;
       patches =