Unnecessary overhead in getdate()

Hello, Just like `[i]date()`, `getdate()` without the `$timestamp` argument uses the current timestamp. The code for `[i]date()` (https://github.com/php/php-src/blob/master/ext/date/php_date.c#L1276) only makes a system call to `time(NULL)` when the `$timestamp` argument is missing. In contrast `getdate()` (https://github.com/php/php-src/blob/master/ext/date/php_date.c#L1828) always performs a system call to `time(NULL)` even if `$timestamp` is supplied by the user. The code for `getdate()` should mimic what is done for `date()` to avoid unnecessary system call overhead, hence only call `time(NULL)` when `!ZEND_NUM_ARGS()`. Can someone please make the appropriate change? Please apologize, but I simply review code and do not have a proper C development setup that allows me to supply patches or create pull requests. Thanks, Ben -- Benjamin Coutu http://www.zeyos.com