MINOR: h2: create a very minimalistic h2 mux
This one currently does nothing and rejects every connection. It
registers ALPN token "h2".
diff --git a/Makefile b/Makefile
index 0b9bccf..6b9e634 100644
--- a/Makefile
+++ b/Makefile
@@ -849,7 +849,7 @@
src/listener.o src/acl.o src/flt_http_comp.o src/filters.o src/dns.o \
src/cli.o src/flt_trace.o src/connection.o src/session.o src/vars.o \
src/hpack-dec.o src/hpack-enc.o src/hpack-tbl.o src/hpack-huff.o \
- src/map.o src/payload.o src/namespace.o src/compression.o \
+ src/mux_h2.o src/map.o src/payload.o src/namespace.o src/compression.o \
src/mailers.o src/auth.o src/proto_udp.o src/memory.o src/freq_ctr.o \
src/signal.o src/uri_auth.o src/buffer.o src/task.o src/chunk.o \
src/channel.o src/lru.o src/xxhash.o src/time.o src/fd.o src/pipe.o \