BOOST_FT_AUTODETECT_CALLING_CONVENTIONS ignored when including <boost/uuid/random_generator.hpp>

Hi,

I' ve got a project which uses Boost.UUID and function_types.
When compiling for Windows-x86 I define BOOST_FT_AUTODETECT_CALLING_CONVENTIONS before including

thereafter I include

but then "boost::function_types::stdcall_cc" is not defined.
There seems to be a problem with the define/undef of the macro "callable_builtin" in

When I first include the type "boost::function_types::stdcall_cc" is defined.
I'm not sure if the define/undef of the macro "callable_builtin" could even violate ODR.

Reproduce the Windows-x86 include sequence using followed by , with BOOST_FT_AUTODETECT_CALLING_CONVENTIONS defined first. Inspect boost/function_types/detail/encoding/aliases_[un]def.hpp and the handling of callable_builtin. Done means boost::function_types::stdcall_cc remains defined for this include order and the reported compilation succeeds.

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