Serialization linker errors

[Hartmut Kaiser]

The MS header file excpt.h has a

    #define exception_code _exception_code

which leads to problems if not consistently included.

The bottom line is, that archive_exception.cpp needs to be compiled with exactly the same windows headers included (excpt.h gets included by windows.h) as any sources including archive_exception.hpp, which is generally not possible to ensure.

The only fail-proof way I could see is to always have

    #if defined(BOOST_WINDOWS)
    #include <excpt.h>
    #endif

inside archive_exception.hpp, globally mapping exception_code to _exception_code. Patch attached.

[Robert Ramey]

patch moved into trunk