osx fixes for marble / subsurface build.

[Jan Mulder]

On 04/26/15 20:51, Tomaz Canabrava wrote:

> fixed issue with CMake on marble ( that used the incorrect path for 
> the library )
> fixed a few issues with build.sh / subsurface
>
> please note that this shouldn`t break anything for non mac users, and 
> mac users - please note that this shouldn`t break anything, but 
> instead make it work.

Hard coded reference to .dylib  library files break the build on (I 
expect) all non-mac users. My build (on Arch Linux) succeeded by simply 
renaming it to .so