rrdtool: added "LD=$CC" to rrdtool.conf, see comment.

database/rrdtool/rrdtool.conf

@@ -2,7 +2,7 @@
 # This copyright note is auto-generated by ./scripts/Create-CopyPatch.
 #
 # Filename: package/.../rrdtool/rrdtool.conf
-# Copyright (C) 2006 - 2011 The OpenSDE Project
+# Copyright (C) 2006 - 2014 The OpenSDE Project
 # Copyright (C) 2004 - 2006 The T2 SDE Project
 # Copyright (C) 1998 - 2003 Clifford Wolf
 #
@@ -14,6 +14,10 @@
 # GNU General Public License can be found in the file COPYING.
 # --- SDE-COPYRIGHT-NOTE-END ---
 
+# LD=$CC is a hack that for now (2014-07-08) we need for 
+# unknown reasons, please study and remove if cause is found.
+var_append makeopt ' ' "LD=$CC"
+
 var_append configcache ' ' "rd_cv_ms_async=ok"
 var_append extraconfopt " " "--enable-shared"