Fix build on native 64-bit architecture

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%403779

build-scripts/fatbuild.sh

@@ -218,9 +218,15 @@ case `uname -p` in
     powerpc)
         native_path=ppc
         ;;
+    powerpc64)
+        native_path=ppc64
+        ;;
     *86)
         native_path=x86
         ;;
+    x86_64)
+        native_path=x64
+        ;;
     *)
         echo "Couldn't figure out native architecture path"
         exit 1