libfirm: Update for release.

chmallon · chmallon · commit 2ea8db66635d · 2015-12-31T23:48:10.000+01:00
diff --git a/libfirm b/libfirm
@@ -1 +1 @@
-Subproject commit 4a50f14dddbd9cd394fe9abe904f4e1c17f0ef1a
+Subproject commit 2259fe4777fa51374c3f878a92b8467833e2b4f8
