[babl] extensions/fast-float: temporarily disable

[Øyvind Kolås <ok src gnome org>]

commit a88612d501153b6d3511043506683b8b88a364c1
Author: Øyvind Kolås <pippin gimp org>
Date:   Thu Dec 15 01:34:53 2016 +0100

    extensions/fast-float: temporarily disable
    
    Disable this floating point LUT for now, it treats negative values as their
    positive counterparts, see bug #776113.

 extensions/fast-float.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/extensions/fast-float.c b/extensions/fast-float.c
index ca20cf7..163ffe8 100644
--- a/extensions/fast-float.c
+++ b/extensions/fast-float.c
@@ -694,6 +694,8 @@ init (void)
     babl_component ("B'"),
     NULL);
 
+  return 0;  // XXX: the fast paths registered here doesn't correctly
+             //      clamp negative values - disabling for now
   {
     float f;
     float a;