FWIW, this change made rustc's (and notmuch's, see #1077911) build dependencies unsatisfiable. they both have/had a dependency on gdb, and a conflict on gdb-minimal, since the latter didn't provide all the features required.
with the reversal of provides (gdb providing gdb-minimal instead of the other way round), this combination is now unsatisfiable. the new provides make more sense, so mainly leaving this here on zumby's request (and for any other packages using such a combination ;)), not asking for a revert or anything like that..
