[fmatrixtest] Drop dummy.f.

Jö Fahlkerequested to merge
fix/kill-useless-dummy.f into master

I have no idea why fmatrixtest compiled and linked dummy.f, and it made compilation fail in the absence of gfortran.

[DONE] Check that linking against a static liblapack still works. (fmatrixtest simply does not seem to need lapack)

Planned merge: 2016-11-26

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