libwebsockets : bump version to v1.3-chrome37-firefox30

Bumped the version and did some trivial reworking of the patch file :
libwebsockets-0002-cmake-disable-shared-library-build-when-BUILD_SHARED.patch

[Thomas:
 - Pass LWS_IPV6={ON,OFF} depending on the value of BR2_INET_IPV6,
   otherwise the build failed in a non-IPv6 configuration.
 - The name of the CMake option for OpenSSL support has changed, it's
   now LWS_WITH_SSL={ON,OFF}.
 - Adjust the description of patch 0002.]

Signed-off-by: Sagaert Johan <sagaert.johan@skynet.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>