make sure to prevent modsecurity use pcre_malloc and pcre_free directly

nginx with pcre prevent original pcre_malloc and pcre_free ngx_http_modsecurity_pcre_malloc_init/done is required before call pcre.

src/ngx_http_modsecurity_module.c

@@ -633,6 +633,7 @@ static ngx_int_t ngx_http_modsecurity_init_process(ngx_cycle_t *cycle) {
  ngx_log_t *log = cycle->log;
  ngx_uint_t log_level = log->log_level;
  log->log_level = NGX_LOG_NOTICE;
+ ngx_pool_t *old_pool = ngx_http_modsecurity_pcre_malloc_init(mmcf->pool);
  for (cleanup = cycle->pool->cleanup; cleanup; cleanup = cleanup->next) {
  if (cleanup->handler == ngx_http_modsecurity_cleanup_rules) {
  ngx_http_modsecurity_conf_t *mcf = cleanup->data;
@@ -648,6 +649,7 @@ static ngx_int_t ngx_http_modsecurity_init_process(ngx_cycle_t *cycle) {
  }
  }
  }
+ ngx_http_modsecurity_pcre_malloc_done(old_pool);
  log->log_level = log_level;
  return NGX_OK;
 }