REORG: include: split common/htx.h into haproxy/htx{,-t}.h
Most of the file was a large set of HTX elements manipulation functions
and few types, so splitting them allowed to further reduce dependencies
and shrink the build time. Doing so revealed that a few files (h2.c,
mux_pt.c) needed haproxy/buf.h and were previously getting it through
htx.h. They were fixed.
diff --git a/src/payload.c b/src/payload.c
index ca9c9d7..7d7cb36 100644
--- a/src/payload.c
+++ b/src/payload.c
@@ -15,7 +15,7 @@
#include <haproxy/api.h>
#include <haproxy/net_helper.h>
-#include <common/htx.h>
+#include <haproxy/htx.h>
#include <proto/acl.h>
#include <proto/arg.h>
#include <proto/channel.h>