Import erc-bbdb.el, erc-chess.el, erc-nicklist.el, and erc-speak.el

* lisp/erc/erc-bbdb.el, lisp/erc/erc-chess.el,
lisp/erc/erc-nicklist.el, lisp/erc/erc-speak.el: Import these files
from commit 9497cc92bf1feb63c24425c46b1e033265c2cea9 of
https://git.savannah.gnu.org/cgit/erc.git, the old ERC repository
outside the GNU Emacs source tree.  These FSF-copyrighted files were
part of ERC before erc.git was (for the most part) folded into
emacs.git, but they were left out largely due to depending on packages
outside Emacs.  It is worth noting that their dependencies are all
free software, and bbdb and chess are actually available on GNU ELPA.
2 jobs for scratch/erc-oldies in 32 minutes and 47 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Test
failed #7582
test-filenotify-gio

00:28:59

failed #7583
test-gnustep

00:32:46

 
Name Stage Failure
failed
test-gnustep Test
Makefile:318: recipe for target 'compile-main' failed
make[2]: Leaving directory '/builds/emacs/emacs/lisp'
make[2]: *** [compile-main] Error 2
make[1]: *** [lisp] Error 2
Makefile:411: recipe for target 'lisp' failed
make[1]: Leaving directory '/builds/emacs/emacs'
Makefile:1124: recipe for target 'bootstrap' failed
make: *** [bootstrap] Error 2
ERROR: Job failed: exit code 1
failed
test-filenotify-gio Test
Makefile:318: recipe for target 'compile-main' failed
make[2]: Leaving directory '/builds/emacs/emacs/lisp'
Makefile:411: recipe for target 'lisp' failed
make[1]: Leaving directory '/builds/emacs/emacs'
Makefile:1124: recipe for target 'bootstrap' failed
make[2]: *** [compile-main] Error 2
make[1]: *** [lisp] Error 2
make: *** [bootstrap] Error 2
ERROR: Job failed: exit code 1