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


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@374801 35697150-7ecd-e111-bb59-0022644237b5
net-mgmt/seafile: Fix kernel thread support on DragonFly

PR:		196008
Submitted by:	maintainer


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@374802 35697150-7ecd-e111-bb59-0022644237b5