[gnome-continuous] Update harfbuzz tag

[Emmanuele Bassi <ebassi src gnome org>]

commit 6427921939d3abeddce064dc8ce548ea7ff0ecd9
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Wed Apr 5 15:27:00 2017 +0100

    Update harfbuzz tag
    
    Use an earlier commit to avoid the whole CMake addition.

 manifest.json |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/manifest.json b/manifest.json
index 1d6339a..6b30a3e 100644
--- a/manifest.json
+++ b/manifest.json
@@ -165,7 +165,7 @@
                 "tag": "0b17ee79bf5237ffdc3a2a7480023a7d61063788"},
 
                {"src": "git:git://anongit.freedesktop.org/harfbuzz",
-                 "tag": "7d64c0ef37dd930e9807bd80d398491aa9c4428c",
+                 "tag": "740fdbcd0e6d25c1d6f12537ca2aa559650b9d52",
                  "tag-reason": "Build failure"},
 
                {"src": "git:git://git.sv.nongnu.org/freetype/freetype2.git",