REORG: include: move common/chunk.h to haproxy/chunk.h

No change was necessary, it was already properly split.
diff --git a/src/htx.c b/src/htx.c
index 82c788b..d1679a2 100644
--- a/src/htx.c
+++ b/src/htx.c
@@ -10,7 +10,7 @@
  *
  */
 
-#include <common/chunk.h>
+#include <haproxy/chunk.h>
 #include <common/htx.h>
 
 struct htx htx_empty = { .size = 0, .data = 0, .head  = -1, .tail = -1, .first = -1 };