Remove obsolete epg functions

* lisp/epg.el (epg-start-sign-keys, epg-sign-keys): Remove
functions declared obsolete since Emacs 23.1.
1 job for master in 90 minutes and 1 second (queued for 3 seconds)
Status Job ID Name Coverage
  Test
failed #1790
test-all

01:30:01

 
Name Stage Failure
failed
test-all Test The script exceeded the maximum execution time set for the job
  ELC      lisp/progmodes/f90-tests.elc
GEN lisp/progmodes/f90-tests.log
ELC lisp/progmodes/flymake-tests.elc
GEN lisp/progmodes/flymake-tests.log
ELC lisp/progmodes/js-tests.elc
GEN lisp/progmodes/js-tests.log
ELC lisp/progmodes/python-tests.elc
Pulling docker image gitlab/gitlab-runner-helper:x86_64-f100a208 ...
ERROR: Job failed: execution took longer than 1h30m0s seconds