hls: Report the current media sequence

Useful for debugging mostly.
segment: Report the current media sequence

Useful for debugging mostly.
hls: Print start_number as first sequence value

The option now behaves as expected.
hls: Factor the sequence computation
hls: Sync the file number with the start sequence
librtmp: Map native options to librtmp ones when possible

Makes the two protocols nearly seamless.

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
matroskadec: read the CodecDelay element
disable -rpath-link on Solaris

The Solaris -rpath linker option parser is greedy.
build: add Solaris symbol versioning

The Solaris linker does not support globs in linker scripts for
symbol versioning (this is a GNU extension). Let's instead borrow
make_sunver.pl from GCC to make a description file that works
with the Solaris linker.