Bug#981515: kcoreaddons: please replace fam with gamin

[Glenn Strauss <gs-debian.org@gluelogic.com>]

gamin provides libfam0.

kcoreaddons should load just fine with libfam0 from gamin.

I did the research in #510368 and #966273, reviewing the actual code
and confidentally concluded that FAM can be removed from Bullseye.

The safest choice is to have a single library (gamin) used in the
distro, rather than having both FAM and gamin.

Please pick up the trivial change in
https://salsa.debian.org/qt-kde-team/kde/kcoreaddons/-/merge_requests/3
so that kcoreaddons is not blocking progress.

Thank you.  Glenn