[Debian GNUstep maintainers] gnustep-base transition

[Yavor Doganov]

Results from the rebuild:

Packages which FTBFS:
dbuskit
plopfolio.app

Both are trivial to fix, can be done before the transition.  Since
they are under our maintainership, I plan to report the bugs while
-base is still in the NEW queue.

Packages which have new GCC warnings with gnustep-base/1.25.0:
agenda.app
gnumail
gnustep-dl2
gnustep-examples
gnustep-gui
gorm.app
grr.app
gtamsanalyzer.app
gworkspace
lusernet.app
mpdcon.app
sope

These new warnings are mostly due to the change of the
NSArray/NSMutableArray sort function return type in
-sortedArrayUsingFunction:context: and -sortUsingFunction:context:,
which is now NSComparisonResult:

MPDController.m:879:38: warning: passing argument 1 of 'sortedArrayUsingFunction:context:' from incompatible pointer type [-Wincompatible-pointer-types]
                                      context: NULL];
                                      ^~~~~~~
MPDController.m:879:38: note: expected 'NSComparisonResult (*)(struct objc_object *, struct objc_object *, void *) {aka long int (*)(struct objc_object *, struct objc_object *, void *)}' but argument is of type 'int (*)(struct objc_object *, struct objc_object *, void *)'

There should be no runtime problems here.  Packages that are actively
maintained upstream should be fixed already.  We'll fix the abandoned
ones at some point, nothing urgent.