ext/pcntl: signals list update for dragonflybsd related to checkpoint.

- SIGCKPT checkpoint and continue.
- SIGCKPTEXIT checkpoint and exit.

Close GH-14011

Author: devnexen

NEWS

@@ -136,6 +136,7 @@ PHP                                                                        NEWS
     more in line with platforms limits. (David Carlier)
   . Added pcntl_getcpu for Linux/FreeBSD. (David Carlier)
   . Added pcntl_getqos_class/pcntl_setqos_class for macOs. (David Carlier)
+  . Added SIGCKPT/SIGCKPTEXIT constants for DragonFlyBSD. (David Carlier)
 
 - PCRE:
   . Upgrade bundled pcre2lib to version 10.43. (nielsdos)

UPGRADING

@@ -593,6 +593,8 @@ PHP 8.4 UPGRADE NOTES
   . QosClass::UserInteractive (macOs only).
   . QosClass::UserInitiated (macOs only).
   . QosClass::Utility (macOs only).
+  . SIGCKPT (DragonFlyBSD only).
+  . SIGCKPTEXIT (DragonFlyBSD only).
 
 - Standard:
   . PHP_ROUND_CEILING.

ext/pcntl/pcntl.stub.php

@@ -243,6 +243,20 @@
  */
 const SIGBABY = UNKNOWN;
 #endif
+#ifdef SIGCKPT
+/**
+ * @var int
+ * @cvalue LONG_CONST(SIGCKPT)
+ */
+const SIGCKPT = UNKNOWN;
+#endif
+#ifdef SIGCKPTEXIT
+/**
+ * @var int
+ * @cvalue LONG_CONST(SIGCKPTEXIT)
+ */
+const SIGCKPTEXIT = UNKNOWN;
+#endif
 #ifdef SIGRTMIN
 /**
  * @var int