Fix GH-9669: phpdbg -h options doesn't list the -z option

Adds `-z` flag in phpdbg output.

Closes GH-9713.

Author: adsr

NEWS

@@ -38,6 +38,9 @@ PHP                                                                        NEWS
 - PCRE:
   . Mangle PCRE regex cache key with JIT option. (mvorisek)
 
+- PHPDBG:
+  . Fixed bug GH-9669 (phpdbg -h options doesn't list the -z option). (adsr)
+
 - PDO SQLite:
   . Fix GH-11492 (Make test failure: ext/pdo_sqlite/tests/bug_42589.phpt).
     (KapitanOczywisty, CViniciusSDias)

sapi/phpdbg/phpdbg_help.c

@@ -398,6 +398,7 @@ phpdbg_help_text_t phpdbg_help_text[] = {
 "  **-s**      **-s=**, **-s**=foo         Read code to execute from stdin with an optional delimiter" CR
 "  **-S**      **-S**cli               Override SAPI name, careful!" CR
 "  **-p**      **-p**, **-p=func**, **-p* **   Output opcodes and quit" CR
+"  **-z**      **-z**extlib            Load Zend extension" CR
 "  **-h**                          Print the help overview" CR
 "  **-V**                          Print version number" CR
 "  **--**      **--** arg1 arg2        Use to delimit phpdbg arguments and php $argv; append any $argv "