package/libwebsockets: bump to version 4.3.1

This is quite a version jump, so there are a lot of individual changes,
see: https://github.com/warmcat/libwebsockets/blob/v4.3.1/changelog

LICENSE has also changed:

- More items with license "MIT" were added:
  - lib/misc/base64-decode.c
  - lib/plat/windows/windows-resolv.c
- One more item with a 2-Clause BSD license was added:
  - lib/misc/ieeehalfprecision.c
- Sublicense texts were copied into LICENSE

These should still be compatible with "MIT with exceptions" stated in
`libwebsockets.mk`.

Signed-off-by: Johannes Agricola <johannes.agricola@work-microwave.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/libwebsockets/libwebsockets.hash

@@ -1,3 +1,3 @@
 # Locally computed:
-sha256  6ece1f422c6d38aabedec2476f2ac12e9aede8691b08137068ad85545ce3ff78  libwebsockets-4.0.21.tar.gz
-sha256  5756db345eb9c21cb06dd7cb69c38ec234657a233f9a186b4f5fa453681bd394  LICENSE
+sha256  8fdb1454a1b34cd9a6351beaab237a485e6853806101de7e62bd2bc250bb50af  libwebsockets-4.3.1.tar.gz
+sha256  2b5dd8030691f3d1870a040f085c37e45d9ab9c684a7f1284f5f379c1e829b28  LICENSE

package/libwebsockets/libwebsockets.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-LIBWEBSOCKETS_VERSION = 4.0.21
+LIBWEBSOCKETS_VERSION = 4.3.1
 LIBWEBSOCKETS_SITE = $(call github,warmcat,libwebsockets,v$(LIBWEBSOCKETS_VERSION))
 LIBWEBSOCKETS_LICENSE = MIT with exceptions
 LIBWEBSOCKETS_LICENSE_FILES = LICENSE