REORG: include: move ist.h from common/ to import/
Fortunately that file wasn't made dependent upon haproxy since it was
integrated, better isolate it before it's too late. Its dependency on
api.h was the result of the change from config.h, which in turn wasn't
correct. It was changed back to stddef.h for size_t and sys/types.h for
ssize_t. The recently added reference to MAX() was changed as it was
placed only to avoid a zero length in the non-free-standing version and
was causing a build warning in the hpack encoder.
diff --git a/include/types/ring.h b/include/types/ring.h
index ac93c12..f3b3987 100644
--- a/include/types/ring.h
+++ b/include/types/ring.h
@@ -24,7 +24,7 @@
#include <haproxy/api-t.h>
#include <common/buf.h>
-#include <common/ist.h>
+#include <import/ist.h>
/* The code below handles circular buffers with single-producer and multiple
* readers (up to 255). The buffer storage area must remain always allocated.