disable format-security due swig generated code

disable format-security due swig generated code

llvm-3.8.0.src/build/tools/lldb/scripts/LLDBWrapPython.cpp: In function ‘PyObject* _wrap_SBError_SetErrorStringWithFormat__SWIG_3(PyObject*, PyObject*)’:
llvm-3.8.0.src/build/tools/lldb/scripts/LLDBWrapPython.cpp:21362:70: error: format not a string literal and no format arguments [-Werror=format-security]
     result = (int)(arg1)->SetErrorStringWithFormat((char const *)arg2);