LIBKSBA fixes for Windows

[carlo.bramix at libero.it]

Hello,
attached to this email there is a very simple fix that allows to compile 
libksba-1.0.8 on mingw+msys.
I could not file a bug to bugzilla, I received an error of html page not 
found.
Since it's so small, I hope it can be accepted by email too.

Sincerely,

Carlo Bramini.
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