Branch b1_6

b=16437
i=cliff.white, brian

Enable the '-m64' flag for powerpc64 patchless build.

lustre/liblustre/genlib.sh

@@ -13,7 +13,12 @@ set -e
 
 AR=/usr/bin/ar
 # see http://osdir.com/ml/gmane.comp.gnu.binutils.bugs/2006-01/msg00016.php
-LD=gcc
+ppc64_CPU=`uname -p`
+if [ ${ppc64_CPU} == "ppc64" ]; then
+  LD="gcc -m64"
+else
+  LD="gcc"
+fi
 RANLIB=/usr/bin/ranlib
 
 CWD=`pwd`