* lisp/gnus/gnus.el (gnus-info): Define with `cl-defstruct`

This makes the accessors into (inlined) functions (instead of macros),
which simplifies some uses, and it makes the gnus-info-set-<foo>
macros redundant since we can use `setf` instead.  Remove them and
update all users.

(gnus-info-group, gnus-info-rank, gnus-info-read, gnus-info-marks)
(gnus-info-method, gnus-info-params): Auto-defined by defstruct.
(gnus-info-level, gnus-info-score): Define as a function.  Add gv-setter.
(gnus-info-set-group, gnus-info-set-rank, gnus-info-set-read): Remove,
use `setf` instead.
(gnus-info-set-marks, gnus-info-set-method, gnus-info-set-params):
Define as a function.
(gnus-info-set-entry): Delete function.
(gnus-info--grow-entry): New function, extracted from it.
(gnus-info--set-level, gnus-info--set-score): New functions, extracted
from the `gnus-info-set-level` and `gnus-info-set-score` which they replace.
(gnus-get-info): Define as a function.

* lisp/gnus/gnus-group.el (gnus-group-edit-group-done):
Use the `extend` arg of `gnus-info-set-method`.
(gnus-group-sort-selected-flat): eta-reduce.
1 job for master in 55 minutes and 18 seconds (queued for 1 second)
Status Job ID Name Coverage
failed #4389


Name Stage Failure
test-all Test
Makefile:319: recipe for target 'check-doit' failed
make[2]: Leaving directory '/builds/emacs/emacs/test'
make[2]: *** [check-doit] Error 1
Makefile:294: recipe for target 'check-expensive' failed
make[1]: Leaving directory '/builds/emacs/emacs/test'
make[1]: *** [check-expensive] Error 2
Makefile:959: recipe for target 'check-expensive' failed
make: *** [check-expensive] Error 2
ERROR: Job failed: exit code 1