date_time & MSVC: no __declspec(dllexport)

[nobody]

Microsoft compiler specific.

The date and time library doesn't declare any of its
classes for export, which means that they get stripped
from the DLLs that are produced.

Temporary workaround is to use the static library,
however for those of use wanting to make a big ol' bag
o' boost everything-included dll, this is a problem.

david@firepro.co.za

[az_sw_dude]

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This problem has been resolved in the 1_31 boost release.