[gnome-builder] build: mark lto experimental

[Christian Hergert <chergert src gnome org>]

commit f0c5da661fc8253ef98d7a0dd4b794f94b2916ee
Author: Christian Hergert <christian hergert me>
Date:   Wed May 20 03:21:02 2015 -0700

    build: mark lto experimental
    
    This is very much experimental, mark it as such. Notably there seems to
    be issues with types getting registered multiple times.

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index c2da5e6..b258972 100644
--- a/configure.ac
+++ b/configure.ac
@@ -384,7 +384,7 @@ echo ""
 echo "  Prefix ............................... : ${prefix}"
 echo "  Libdir ............................... : ${libdir}"
 echo "  Optimized Build ...................... : ${enable_optimizations}"
-echo "  Link-Time-Optimization ............... : ${enable_lto}"
+echo "  Link-Time-Optimization (experimental). : ${enable_lto}"
 echo "  rdtscp ............................... : ${enable_rdtscp}"
 echo ""
 echo " Development Options"