MINOR: pools: export trim_all_pools()

This way it will be usable from outside instead of malloc_trim().

include/haproxy/pool.h

@@ -103,6 +103,7 @@ extern uint pool_debugging;
 
 int is_trim_enabled(void);
 int malloc_trim(size_t pad);
+void trim_all_pools(void);
 
 void *pool_get_from_os(struct pool_head *pool);
 void pool_put_to_os(struct pool_head *pool, void *ptr);

src/pool.c

@@ -116,7 +116,7 @@ static int(*_malloc_trim)(size_t) = NULL;
  * its job. We just have to be careful as callers might already be isolated
  * themselves.
  */
-static void trim_all_pools(void)
+void trim_all_pools(void)
 {
 	int isolated = thread_isolated();