make warning

In file included from /tmp/ev-1.0.4/php7/evwrap.c:2:0:
/tmp/ev-1.0.4/php7/../libev/ev.c:1825:31: warning: 'ev_default_loop_ptr' initialized and declared 'extern'
   EV_API_DECL struct ev_loop *ev_default_loop_ptr = 0; /* needs to be initialised to make it a definition despite extern */
                               ^
/tmp/ev-1.0.4/php7/../libev/ev.c: In function 'evpipe_write':
/tmp/ev-1.0.4/php7/../libev/ev.c:2454:11: warning: ignoring return value of 'write', declared with attribute warn_unused_result [-Wunused-result]
           write (evpipe [1], &counter, sizeof (uint64_t));
           ^
/tmp/ev-1.0.4/php7/../libev/ev.c:2466:11: warning: ignoring return value of 'write', declared with attribute warn_unused_result [-Wunused-result]
           write (evpipe [1], &(evpipe [1]), 1);
           ^
/tmp/ev-1.0.4/php7/../libev/ev.c: In function 'pipecb':
/tmp/ev-1.0.4/php7/../libev/ev.c:2487:11: warning: ignoring return value of 'read', declared with attribute warn_unused_result [-Wunused-result]
           read (evpipe [1], &counter, sizeof (uint64_t));
           ^
/tmp/ev-1.0.4/php7/../libev/ev.c:2501:11: warning: ignoring return value of 'read', declared with attribute warn_unused_result [-Wunused-result]
           read (evpipe [0], &dummy, sizeof (dummy));

Env:

PHP 7.2.3-1+ubuntu16.04.1+deb.sury.org+1 (cli) (built: Mar  6 2018 11:18:25) ( NTS )
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.2.0, Copyright (c) 1998-2018 Zend Technologies
    with Zend OPcache v7.2.3-1+ubuntu16.04.1+deb.sury.org+1, Copyright (c) 1999-2018, by Zend Technologies

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