--no-location-rewrite option disallows location header rewrite on
--http2-bridge, --client and default mode.  This option is useful when
connecting nghttpx proxy with --http2-bridge to backend nghttpx with
http2-proxy mode.

It might be useful to clean the unused stream out to make up the room
for new streams.  On the other hand, proxy should maintain the
connection between upstream client and downstream server and they have
the timeout for their own.  Proxy just reacts to their decision.

This reverts commit cc24b9aa.

This function is no longer necessary because 0x00 concatenation rule
is gone.

libjemalloc as static library requires -pthread flag to link.  Without
that, the check in configure.ac fails with unresolved symbols.

Thanks to Pascal