Bug#1127799: libdeal.ii-dev must depend on mold where it was used for building

[Graham Inggs]

Control: reopen -1

"libdeal.ii-dev must depend on mold where it was used for building"

This sounds wrong to me.

I think deal.ii is capturing unnecessary information in its
configuration files.  This might be the case for #1130801 also.

I saw mold was on the auto-removal list again, for RC bug #1125245.  I
am considering reverting deal.ii's use of mold, because I don't want
it to depend on an unmaintained package.