package/libwebsockets: fix build with libev

Fixes:
 - http://autobuild.buildroot.org/results/b5a2188dce90f3ca9bf0cc7a043c1a946b8e288f

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
1 file changed