also fix default max for intel's MIC platform

eigen and tbb might've already be discovered by pdelab/common

This reverts commit ba71a7857d78f85ff258834f7820928c253102af
since the update required cmake stuff in common (>=2.4)

Drop support for override and final keyword discovery since all supported
compiler understand those by now. Further use of DS_OVERRIDE or DS_FINAL
will trigger a compile error.

This reverts commit 847555675db1dba6cd6c5d5d9afccf2211f4d124.

There should be a fix in our dune-fem.