Modify libbitcoin repository with libbitcoin-system path name.

Author: pmienk

generate.xml

@@ -2,9 +2,9 @@
 <!-- Copyright (c) 2014-2016 libbitcoin developers (see COPYING). -->
 <generate language="en-us" >
 
-  <repository name="libbitcoin" version="3.4.0" email="eric@voskuil.org" >
+  <repository name="libbitcoin" version="3.4.0" email="eric@voskuil.org" path="libbitcoin-system" >
 
-    <package library="bitcoin" description="Bitcoin Cross-Platform C++ Development Toolkit" url="https://github.com/libbitcoin/libbitcoin" >
+    <package library="bitcoin" description="Bitcoin Cross-Platform C++ Development Toolkit" url="https://github.com/libbitcoin/libbitcoin-system" >
       <flag value="@icu@" />
       <flag value="@png@" />
       <flag value="@qrencode@" />