libebl.h: Add comment from README that this is completely UNSUPPORTED.

Make it really, really clear that the libebl interface is NOT source and
NOT abi compatible and we will break any users.

Signed-off-by: Mark Wielaard <mjw@redhat.com>
diff --git a/libebl/ChangeLog b/libebl/ChangeLog
index 5e635f2..3655e72 100644
--- a/libebl/ChangeLog
+++ b/libebl/ChangeLog
@@ -1,3 +1,8 @@
+2015-01-27  Mark Wielaard  <mjw@redhat.com>
+
+	* libebl.h: Add comment from README that this is completely
+	UNSUPPORTED.
+
 2014-11-22  Mark Wielaard  <mjw@redhat.com>
 
 	* ebl-hooks.h (bss_plt_p): Remove ehdr argument.