Be safer about "%" in message formats

* lisp/calc/calc-store.el (calc-copy-special-constant):
* lisp/net/rcirc.el (rcirc-handler-PART, rcirc-handler-KICK):
* lisp/org/org-agenda.el (org-agenda):
* lisp/org/org-clock.el (org-clock-out, org-clock-display):
* lisp/org/org.el (org-refile):
* lisp/progmodes/ada-xref.el (ada-goto-declaration):
* lisp/progmodes/idlwave.el (idlwave-scan-library-catalogs):
Don’t trust arbitrary strings to not contain "%" or "`" in
(message (concat STRING1 STRING2 ...)).
1 job for master in 50 minutes and 16 seconds (queued for 3 seconds)
Status Job ID Name Coverage
failed #990


Name Stage Failure
test-all Test
Makefile:313: recipe for target 'check-doit' failed
make[2]: *** [check-doit] Error 1
make[2]: Leaving directory '/builds/emacs/emacs/test'
Makefile:288: recipe for target 'check-expensive' failed
make[1]: *** [check-expensive] Error 2
make[1]: Leaving directory '/builds/emacs/emacs/test'
Makefile:962: recipe for target 'check-expensive' failed
make: *** [check-expensive] Error 2
ERROR: Job failed: exit code 1