[vala-extra-vapis] libcolumbus: added notice for known bug

[Evan Nemerson <evann src gnome org>]

commit 033fc9b1a1e5c2edb0a1c408057fdefa9ea317dd
Author: grindhold <grindhold gmx net>
Date:   Mon Oct 3 21:31:10 2016 +0200

    libcolumbus: added notice for known bug
    
    MatchResults.get_relevancy() has a bug in the C-API
    it will return an incorrect value. Will yield correct
    results when upstream has fixed the bug.

 libcolumbus.vapi |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/libcolumbus.vapi b/libcolumbus.vapi
index 892a6c4..93bd227 100644
--- a/libcolumbus.vapi
+++ b/libcolumbus.vapi
@@ -131,6 +131,8 @@ namespace Columbus {
 
         /**
          * Returns the calculated relevancy of the match with number i.
+         * HERE BE DRAGONS: the c-api is broken here. the bug is known
+         * details at: https://bugs.launchpad.net/libcolumbus/+bug/1622424
          */
         public double get_relevancy(size_t i);
     }