With -std=c++-11 shared_ptr is available in the standard library so pulling in
the std::tr1 namespace creates an ambiguous reference.  Simple fix is to stop
doing that but isn't backwards compatible.  We don't care in Gentoo since we'll
always be building barry with -std=c++11 due to libsigc++ abi compatibility.

--- a/tools/bio.cc
+++ b/tools/bio.cc
@@ -42,7 +42,6 @@
 #include "i18n.h"
 
 using namespace std;
-using namespace std::tr1;
 using namespace Barry;
 
 // keeping a record of all the -i device / -o device pin numbers, so
--- a/tools/btool.cc
+++ b/tools/btool.cc
@@ -59,7 +59,6 @@
 #include "barrygetopt.h"
 
 using namespace std;
-using namespace std::tr1;
 using namespace Barry;
 
 std::map<std::string, std::string> SortKeys;