libwebsockets : bump version

bump to v1.23-chrome32-firefox24
The latest releases use the cmake build infrastructure.
Converted the makefile to the cmake infrastructure.
The autotools infrastructure is no longer supported.

[Peter: correct license data, ensure it gets built after openssl if enabled]
Signed-off-by: Sagaert Johan <sagaert.johan@skynet.be>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>