Fix HTTPS streams that use RC4-SHA on recent libcurl versions

ported Orochimarufan change (https://github.com/Gentro/youtube-xbmc-plugin/pull/1) to henrikdk base

Ubuntu users also need to rebuild PyCurl against libcurl-openssl (vs libcurl-gnutls that it ships with by default) before this will work. https://code.google.com/p/wfuzz/wiki/PyCurlSSLBug

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As per xbmc/xbmc#4489

YouTube still uses the obsolete RC4-SHA cipher for video streams.
Recent libcurl version disable it for security reasons.