Remove subsumed regexp branches

* lisp/progmodes/cc-mode.el (c-before-change-check-unbalanced-strings)
(c-after-change-mark-abnormal-strings): Remove `\r' subsumed by `.'.
1 job for master in 65 minutes and 38 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Test
failed #1434
test-all

01:05:38

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