Make some erc function aliases obsolete

* lisp/erc/erc-networks.el (erc-current-network):
* lisp/erc/erc-join.el (erc-autojoin-channels-delayed):
* lisp/erc/erc-backend.el (erc-server-setup-periodical-ping)
(erc-server-send-ping, erc-server-send-queue):
* lisp/erc/erc-autoaway.el (erc-autoaway-reestablish-idletimer)
(autoaway): Adjust callers.

* lisp/erc/erc-compat.el (erc-with-selected-window)
(erc-cancel-timer, erc-make-obsolete)
(erc-make-obsolete-variable): Make these aliases obsolete.
1 job for master in 65 minutes and 35 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Test
failed #6797
test-all

01:05:35

 
Name Stage Failure
failed
test-all Test
Makefile:318: recipe for target 'check-doit' failed
make[2]: *** [check-doit] Error 1
make[2]: Leaving directory '/builds/emacs/emacs/test'
Makefile:293: 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