rtmpproto: Support alternative slist parameter in rtmp URLs

Support the URL scheme where the playpath is in an RTMP URL is
passed as the slist argument and the app is given infront of the
query part of the URL:

rtmp://host[:port]/[app]?slist=[playpath]

(other arguments in the query part are stripped as they are not used)

Signed-off-by: Martin Storsjö <martin@martin.st>
Merge commit '7ce3bd9614717e545af8fb8455032c807e389b78'

* commit '7ce3bd9614717e545af8fb8455032c807e389b78':
  rtmpproto: Support alternative slist parameter in rtmp URLs

Merged-by: Michael Niedermayer <michaelni@gmx.at>
swresample/resample: add missing xmm clobbers

Might fix fate-swr on ICL

Signed-off-by: James Almer <jamrial@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>