[php-src] Issue #8923: error_log on Windows can hold the file write lock

Issue: https://github.com/php/php-src/issues/8923 Author: neil-pearce ### Description The problem can only be seen on a very busy Windows box. If error_log is called then the lock is not immediately released by the file close but at a time that "depends upon available system resources". This is a 'feature' of the Windows function LockFileEx. The problem has already been addressed in the routine ps_files_close (in the file mod_files.c): ``` static void ps_files_close(ps_files *data) { if (data->fd != -1) { #ifdef PHP_WIN32 /* On Win32 locked files that are closed without being explicitly unlocked will be unlocked only when "system resources become available". */ flock(data->fd, LOCK_UN); #endif close(data->fd); data->fd = -1; } } ``` The same logic should be implemented in the routine php_log_err_with_severity (in main.c). ### PHP Version All versions ### Operating System Windows