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/common/http-hdr.h b/include/common/http-hdr.h
index ffca828..77997e3 100644
--- a/include/common/http-hdr.h
+++ b/include/common/http-hdr.h
@@ -28,7 +28,7 @@
#define _COMMON_HTTP_HDR_H
#include <inttypes.h>
-#include <common/ist.h>
+#include <import/ist.h>
/* a header field made of a name and a value. Such structure stores 4 longs so
* it takes 16 bytes on 32-bit systems and 32 bytes on 64-bit systems.