Sync package.xml with documentation: Add missing c-ares configure option

[nberlee]

Brings the package.xml in line with what is
already documented, addressing the oversight
that c-ares was documented but not actually
available for configuration in the PECL
installation process.

[SimonMacIntyre]

I think possibly this appears to be suddenly breaking our builds, since 22.1.1.

FROM php:8.2-fpm-alpine3.17 and installed with:

RUN install-php-extensions openswoole

Error output:

In file included from /tmp/pear/temp/openswoole/ext-src/php_swoole_cxx.h:19,
                 from /tmp/pear/temp/openswoole/ext-src/swoole_channel_coro.cc:20:
/tmp/pear/temp/openswoole/ext-src/php_swoole_private.h:92:2: error: #error "Enable c-ares support, require c-ares library"
   92 | #error "Enable c-ares support, require c-ares library"
      |  ^~~~~
In file included from /tmp/pear/temp/openswoole/ext-src/php_swoole_cxx.h:19,
                 from /tmp/pear/temp/openswoole/ext-src/php_swoole_cxx.cc:1:
/tmp/pear/temp/openswoole/ext-src/php_swoole_private.h:92:2: error: #error "Enable c-ares support, require c-ares library"
   92 | #error "Enable c-ares support, require c-ares library"
      |  ^~~~~
In file included from /tmp/pear/temp/openswoole/ext-src/php_swoole_cxx.h:19,
                 from /tmp/pear/temp/openswoole/ext-src/swoole_client_coro.cc:17:
/tmp/pear/temp/openswoole/ext-src/php_swoole_private.h:92:2: error: #error "Enable c-ares support, require c-ares library"
   92 | #error "Enable c-ares support, require c-ares library"
      |  ^~~~~
In file included from /tmp/pear/temp/openswoole/ext-src/swoole_atomic.cc:17:
/tmp/pear/temp/openswoole/ext-src/php_swoole_private.h:92:2: error: #error "Enable c-ares support, require c-ares library"
   92 | #error "Enable c-ares support, require c-ares library"
      |  ^~~~~
In file included from /tmp/pear/temp/openswoole/ext-src/php_swoole_cxx.h:19,
                 from /tmp/pear/temp/openswoole/ext-src/swoole_client.cc:17:
/tmp/pear/temp/openswoole/ext-src/php_swoole_private.h:92:2: error: #error "Enable c-ares support, require c-ares library"
   92 | #error "Enable c-ares support, require c-ares library"
      |  ^~~~~
In file included from /tmp/pear/temp/openswoole/ext-src/php_swoole_cxx.h:19,
                 from /tmp/pear/temp/openswoole/ext-src/swoole_coroutine_scheduler.cc:19:
/tmp/pear/temp/openswoole/ext-src/php_swoole_private.h:92:2: error: #error "Enable c-ares support, require c-ares library"
   92 | #error "Enable c-ares support, require c-ares library"
      |  ^~~~~
In file included from /tmp/pear/temp/openswoole/ext-src/php_swoole_cxx.h:19,
                 from /tmp/pear/temp/openswoole/ext-src/swoole_coroutine.cc:20:
/tmp/pear/temp/openswoole/ext-src/php_swoole_private.h:92:2: error: #error "Enable c-ares support, require c-ares library"
   92 | #error "Enable c-ares support, require c-ares library"
      |  ^~~~~
In file included from /tmp/pear/temp/openswoole/ext-src/php_swoole_cxx.h:19,
                 from /tmp/pear/temp/openswoole/ext-src/php_swoole.cc:16:
/tmp/pear/temp/openswoole/ext-src/php_swoole_private.h:92:2: error: #error "Enable c-ares support, require c-ares library"
   92 | #error "Enable c-ares support, require c-ares library"
      |  ^~~~~
/tmp/pear/temp/openswoole/ext-src/php_swoole.cc:36:10: fatal error: ares.h: No such file or directory
   36 | #include <ares.h>

[doubaokun]

Pushed a fix: 22.1.2 and reverted this change. c-ares is automatically detected.