libwebsockets: bump to version 2.1.1

Mosquitto combined with version 2.1.0 of libwebsockets yields a failing
system. Version 2.1.1 restores the websocket interface again.

Signed-off-by: Kurt Van Dijck <dev.kurt@vandijck-laurijssen.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/libwebsockets/libwebsockets.hash

@@ -1,2 +1,2 @@
 # Locally computed:
-sha256  bcc96aaa609daae4d3f7ab1ee480126709ef4f6a8bf9c85de40aae48e38cce66  libwebsockets-v2.1.0.tar.gz
+sha256	96183cbdfcd6e6a3d9465e854a924b7bfde6c8c6d3384d6159ad797c2e823b4d  libwebsockets-v2.1.1.tar.gz

package/libwebsockets/libwebsockets.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-LIBWEBSOCKETS_VERSION = v2.1.0
+LIBWEBSOCKETS_VERSION = v2.1.1
 LIBWEBSOCKETS_SITE = $(call github,warmcat,libwebsockets,$(LIBWEBSOCKETS_VERSION))
 LIBWEBSOCKETS_LICENSE = LGPLv2.1 with exceptions
 LIBWEBSOCKETS_LICENSE_FILES = LICENSE