[CMake] Do not build/install import library

[Mathias Gaunard]

On 11/23/2011 10:14 PM, Matthias Gehre wrote:
> Hi,
>
> thanks for this very nice cmake. I switched just recently to get
> lightspark (lightspark.github.com)
> crossplatform, and it worked really smooth.
>
> One question, though: I cannot seem to find a way to _not_
> build/install the import libraries (foobar.dll.a) on win32.
> I do not need them, because I'm using MinGW's direct linking feature.
> All I found was ways to
> rename it, but not to keep it from building.

Use the MODULE type of library