[CMake] Remove lib prefix when generating shared lib under Windows

[Thiébault Benoît]

Hi everyone,

I am using CMake to compile VTK using MinGW. The compilation goes with problem, but it generates libvtkXXX.dll and libvtkXXX.dll.a files.
How can I remove this lib prefix to the generated libraries ?

Thank you for your answers

Kind regards,

Benoît