Fix feature test of BOOST_NO_CXX11_VARIADIC_MACROS
Fix feature test of BOOST_NO_CXX11_VARIADIC_MACROS

Change b41a935 introduced regression failures due to preprocessor errors with respect to the && operator, leading to the following error:

../boost/test/test_tools.hpp:50:87: error: operator '&&' has no right operand
 #if !BOOST_PP_VARIADICS || ((__cplusplus >= 201103L) && BOOST_NO_CXX11_VARIADIC_MACROS)

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