Add patch for libssh2 1.5.0

libssh2 1.5.0 adds support for ssh2_send_signal and libssh2 is too old for that on PHP 8.1 and older.

Author: shivammathur

extension/BuildPhpExtension/patches/ssh2.ps1

@@ -0,0 +1,12 @@
+$path = "config.w32"
+$content = Get-Content $path -Raw
+$old = "        AC_DEFINE('PHP_SSH2_CHANNEL_SIGNAL', 1);"
+$new = @"
+        if (CHECK_FUNC_IN_HEADER("libssh2.h", "libssh2_channel_signal_ex", PHP_PHP_BUILD + "\\include\\libssh2")) {
+            AC_DEFINE('PHP_SSH2_CHANNEL_SIGNAL', 1);
+        }
+"@
+
+if ($content.Contains($old)) {
+    Set-Content $path -Value ($content.Replace($old, $new))
+}