package/libwebsockets: fix static build

Fixes:
http://autobuild.buildroot.net/results/afc/afc56e03a9d410563f43e5d26cf8b12fc4da7e5b/
http://autobuild.buildroot.net/results/922/9221b4967d069c9b634cb1f98ead193593d22dbc/



When the version was bumped, the existing patch to fix static linking
was not proprerly tested, and was missing three new locations to be
fixed.

[Peter: add autobuilder reference]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Sagaert Johan <sagaert.johan@skynet.be>
Cc: Samuel Martin <s.martin49@gmail.com>
Cc: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>