Use TARGET_LINKER_FILE/TARGET_LINKER_FILE_NAME with SpoutLibrary

[scribam]

https://cmake.org/cmake/help/v3.27/manual/cmake-generator-expressions.7.html#genex:TARGET_LINKER_FILE

$<TARGET_LINKER_FILE:tgt>
File used when linking to the tgt target. This will usually be the library that tgt represents (.a, .lib, .so), but for a shared library on DLL platforms, it would be the .lib import library associated with the DLL.

Fix MINGW which generates a file named libSpoutLibrary.dll.a and not SpoutLibrary.lib

[leadedge]

I understand the change but I am not sure what effect this might have on PR #64 for single config generators support by @jockekilby. Could you explain a little more about that.

[jockekilby]

I haven't had a chance to test it but I don't believe this change would have any impact on the functionality I introduced in this commit, but the changes should be made for theSpotGL project as well?

[leadedge]

Thanks very much @jockekilby . I think this is should be a useful addition by @scribam. What I think I will do is make the changes by hand with the original commented out just in case. I will look at SpoutGL as well. I will be busy for a few days but will do so as soon as I can.

[jockekilby]

ok, let me know if you require assistance 😄

[leadedge]

I made the proposed changes and left the old code as comments for reference. I am not sure that the SpoutGL project file needs to be changed since there are independent name definitions already.