Add BOOST_NO_CXX11_EXCECPTION.

Replaces: https://github.com/boostorg/config/pull/285
Fixes https://github.com/boostorg/config/issues/284
See also: https://github.com/boostorg/exception/issues/10

include/boost/config/stdlib/libstdcpp3.hpp

@@ -231,6 +231,7 @@ extern "C" char *gets (char *__s);
 #  define BOOST_NO_CXX11_HDR_RATIO
 #  define BOOST_NO_CXX11_HDR_SYSTEM_ERROR
 #  define BOOST_NO_CXX11_SMART_PTR
+#  define BOOST_NO_CXX11_HDR_EXCEPTION
 #else
 #  define BOOST_HAS_TR1_COMPLEX_INVERSE_TRIG 
 #  define BOOST_HAS_TR1_COMPLEX_OVERLOADS