Link error

[Julien Nabet]

Indeed, the rare case when I build LO on Windows, first time is ok 
because I start with a "make clean", update Visual Studio, Windows, 
Cygwin, ... but once it's built if I want to update my local repo to 
retrieve a new patch it will fail in 99%.

Sometimes cleaning the module is enough but most of the times I must run 
a make clean. For me it's very annoying because I build LO for Windows 
on a laptop far less powerful than my Linux desktop.

Of course, on Linux, I don't encounter this problem.