Add patch (sent upstream) to drop `using namespace std'

This patch is a smaller version of one I've sent upstream. It removes 'using
namespace std' from Interpreter.cpp to avoid errors when -std=c++11 or
-std=gnu++11 is passed to the compiler, as a call to bind(2) can end up
becoming a call to std::bind().

This is required to avoid breaking the build with Qt 5.6.1:

  c++ -c -O2 -pipe -fstack-protector -fno-strict-aliasing -g -std=gnu++11 -pthread -D_THREAD_SAFE -Wall -W -fPIC -DLINUX -DESPEAK -DSOUND_QMOBILITY -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -I. -I. -I/usr/local/include/espeak -I/usr/local/include/qt5/QtMultimedia -I/usr/local/include/qt5/QtSerialPort -IQtMobility -IQtMobility -I/usr/local/include/qt5 -I/usr/local/include/qt5/QtGui -I/usr/local/include/qt5/QtCore -Itmp/moc -I/usr/local/include -I/usr/local/include -I/usr/local/lib/qt5/mkspecs/freebsd-clang -o tmp/obj/Interpreter.o Interpreter.cpp
  Interpreter.cpp:4282:105: error: invalid operands to binary expression ('__bind<int &, sockaddr *, unsigned long>' and 'int')

PR:		212347
Approved by:	fernando.apesteguia@gmail.com (maintainer)

lang/basic256/files/patch-Interpreter.cpp

@@ -0,0 +1,17 @@
+Drop 'using namespace std' to avoid errors when building in C++11 mode. This
+can happen on FreeBSD 10+ and Qt 5.6+, where Qt may end up passing -std=gnu++11
+and lead the call to bind(2) becoming a call to std::bind().
+
+Interpreter.cpp:4282:105: error: invalid operands to binary expression ('__bind<int &, sockaddr *, unsigned long>' and 'int')
+
+Submitted upstream: https://sourceforge.net/p/kidbasic/patches/30/
+--- Interpreter.cpp.orig	2016-09-03 10:00:06 UTC
++++ Interpreter.cpp
+@@ -66,7 +66,6 @@ InpOut32OutType Out32 = NULL;
+ 
+ #include <QtWidgets/QMessageBox>
+ 
+-using namespace std;
+ 
+ #include "LEX/basicParse.tab.h"
+ #include "WordCodes.h"