* Add STREAM_DEP_DEBUG macro switch to enable runtime validation
of depedency tree
* Fix another bug in priority handling; sibling's item is not
queued when ancestor's item is detached
* nghttpx: Fix crash with --http2-bridge and both frontend and
backend TLS
OBS-URL: https://build.opensuse.org/package/show/devel:libraries:c_c++/nghttp2?expand=0&rev=26
