Does not build < 10.0 even if WITH_OPENSSL_PORT:

First errors are:
  CXX      ssl.o
ssl.cc:29:10: fatal error: 'mutex' file not found
#include <mutex>
         ^
In file included from http2.cc:25:
./http2.h:43:19: error: no member named 'move' in namespace 'std'
      : name(std::move(name)), value(std::move(value)), no_index(no_index) {}
             ~~~~~^

Sponsored by:	Absolight
net-mgmt/seafile: Fix kernel thread support on DragonFly

PR:		196008
Submitted by:	maintainer
Rename man pages so that they don't conflict with openssl's.

With hat:	portmgr
Sponsored by:	Absolight
Big Gstreamer update:

Update gstreamer, gstreamer-plugins, -good, -bad and -ugly ports to 1.4.4.
Update gstreamer1-plugins-gnonlin to 1.4.0.
Update py-gstreamer1 and py3-gstreamer1 to 1.4.0.

Add multimedia/gstreamer1-editing-services. GES is a high-level library
for facilitating the creation of audio/video non-linear editors.

Add pulseaudio plugin now that pulseaudio is updated and add the gl plugin.

Drop :keepla from USES=libtool.
Drop @dirrm[try] from plists and drop gnomehier from USE_GNOME
Switch to optionhelpers in multimedia/gstreamer1.

PR:		194922 (merged with my own WIP)
Submitted by:	olivierd
Don't overwrite Perl's lddlflags, and remove a bunch of checks, we always ship
with -shared.

With hat:	perl
Sponsored by:	Absolight