DLLs incremental builds not working for MSVC

[mwasplund]

The root issue here is that MSVC link.exe does not always reset the timestamp for the implib. A fix for this could be to always delete the output files for a build node to ensure they are always created.

[mwasplund]

For now I removed the implib as an output of the build, ideally this should be included to ensure it is present