Icecast: Send 100-continue header if possible

This allows for proper error reporting. Only do
this for non-legacy requests as only Icecast >2.4.0
will reply with a proper status.
Libav seems to accept both, 100 and 200 status codes, but
let's stay close to spec.

Signed-off-by: Anton Khirnov <anton@khirnov.net>
Icecast: Send content-type in all cases

This is needed because Icecast since version 2.4.1 doesn't default
to audio/mpeg anymore. AVOption default not used here, since a later
check if -content_type is set is performed and would break.

Signed-off-by: Anton Khirnov <anton@khirnov.net>
Merge commit '3a6bb9735053c453f806ceab1d91124648d90aca'

* commit '3a6bb9735053c453f806ceab1d91124648d90aca':
  Icecast: Send 100-continue header if possible

See: 17dc39e76baf8a481fc8b1d24ee4cf7a6ffe1c1d
Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '8562c1483ba647f562e4c1df68a9231274b80e6b'

* commit '8562c1483ba647f562e4c1df68a9231274b80e6b':
  Icecast: Send content-type in all cases

See: 5e08b54f47e8168e1f8203d9b5d0d1fba3c9f822
Merged-by: Michael Niedermayer <michaelni@gmx.at>
mov.c: fix handling of seek return in read_mfra

this would cause mfra to be ignored in files larger than 2G

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>