[boost] [exception] missing workarounds for msvc 4265 warning

From: Jürgen Hunold (juergen.hunold_at_[hidden])
Date: 2008-08-19 03:27:32

Hi !

My coworkers found some more annoying msv 4265 warnings. (missing virtual 
destructor. The attached patch adds the necessary workaround (analog to gcc).

Okay to commit ?

Yours,

Jürgen
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