[Patch, Fortran testsuite, committed] Add/fix dg-final cleanup-module

[Tobias Burnus]

This patch fixes dg-final cleanup-modules issues:
* Missing cleanups
* Wrong case: All module files are lower case
* Wrong cleanup (clean up .mod which don't exist instead of the one 
which exists)

One test case actually failed because it had a spurious "use foo" in it 
- I have now deleted that line instead of creating a dummy module ...

There might be still some missing or wrong cleanups, but most remaining 
.mod files are from gfortran.fortran-torture.

Regtested on x86-64-linux and committed as Rev. 177184.

Tobias
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