We may run into race condition if execve is called at the same time
when fcntl is called.  But we just does this for now to compile
nghttp2 applications under older kernel.

This also means that at least one stream whose dpri is
NGHTTP2_STREAM_DPRI_TOP exists, its siblings descendants have no
chance to send streams, even if their parent stream has
NGHTTP2_STREAM_DPRI_NODATA.

Now we don't use std::future with --disable-threads, checking
std::future in configure.ac was removed and building h2load is always
enabled.

Since recently used headers are in dynamic header table, it is
advantageous to search dynamic table first, saving time to search
through static table.

tiny-nghttpd is HTTP/2 server and its purpose is measure the
performance of nghttp2 library code.  Currently it only accepts direct
HTTP/2 connection only.

Previously when nghttp2_stream_resume_deferred_data() is called,
deferred flags in stream->flags are all cleared.  This is not ideal
because if application returned NGHTTP2_ERR_DEFERRED, and also that
stream is deferred by flow control, then all flags are cleared and
read callback will be invoked again.  This commit fixes this issue.
This changes error condition of nghttp2_session_resume_data().
Previously we return error if stream was deferred by flow control.
Now we don't return error in this case.  We just clear
NGHTTP2_FLAG_DEFERRED_USER and if still
NGHTTP2_FLAG_DEFERRED_FLOW_CONTROL is set, just return 0.