Replaced throw() with BOOST_NOEXCEPT_OR_NOTHROW

With throw(), Visual Studio 2017 emitted a warning "C26439 SPECIAL_NOEXCEPT". Reproducible at least if code analysis was set to level: "Microsoft Native Recommended Rules".

https://docs.microsoft.com/en-us/visualstudio/code-quality/c26439?view=vs-2017

src/clone_current_exception_non_intrusive.cpp

@@ -230,7 +230,7 @@ namespace
             {
             }
 
-        ~cloned_exception() throw()
+        ~cloned_exception() BOOST_NOEXCEPT_OR_NOTHROW
             {
             }