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Pass `OBJECT` option to `add_dune_mpi_flags`

Merged Pass `OBJECT` option to `add_dune_mpi_flags`
bugfix/UseUG-pass-OBJECT-option into master
Merged Ansgar Burchardt requested to merge bugfix/UseUG-pass-OBJECT-option into master
  1. Jan 04, 2017
    • Ansgar Burchardt's avatar
      Pass `OBJECT` option to `add_dune_mpi_flags` · f39c61bb
      Ansgar Burchardt authored 
      The `OBJECT` option has to be passed on to `add_dune_mpi_flags`.
Otherwise one will get an error when using the parallel version of UG
with object libraries:

```
CMake Error at [...]/dune-common/cmake/modules/DuneMPI.cmake:62 (target_link_libraries):
  Object library target "[...]" may not link to anything.
Call Stack (most recent call first):
  [...]/dune-grid/cmake/modules/UseUG.cmake:206 (add_dune_mpi_flags)
  [...]/CMakeLists.txt:62 (add_dune_ug_flags)
```
      f39c61bb