[empathy] Leave note in NEWS regarding GNU make-ism

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 29dad613a4684498ed18df94e50d34a29362c720
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Sun Aug 7 12:30:52 2016 -0500

    Leave note in NEWS regarding GNU make-ism

 NEWS |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)
---
diff --git a/NEWS b/NEWS
index eab7ac7..65752fc 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,12 @@
+NEW in 3.
+=========
+
+This release assumes the use of GNU Make. See the following links for details
+on why you probably do not want to attempt to use an alternative implementation:
+
+https://bugzilla.gnome.org/show_bug.cgi?id=685837
+https://www.gnu.org/software/automake/manual/automake.html#Multiple-Outputs
+
 NEW in 3.12.12 (13/05/2016)
 ==============