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

checks/std/cpp_lib_generic_associative_lookup_14.cpp

@@ -1,4 +1,4 @@
-//  This file was automatically generated on Sun Apr 21 09:13:03 2019
+//  This file was automatically generated on Fri Aug 23 11:11:12 2019
 //  by libs/config/tools/generate.cpp
 //  Copyright John Maddock 2002-4.
 //  Use, modification and distribution are subject to the