CC Mode: Correct some incorrect regular expressions:

* lisp/progmodes/cc-awk.el (c-awk-regexp-char-list-re): "^" -> "\\^".  R*x?R*
-> \(R*x\)?R*.

* lisp/progmodes/cc-mode.el (c-after-change-re-mark-unbalanced-strings): "|"
-> "\\|".
1 job for master in 60 minutes and 1 second (queued for 1 second)
Status Job ID Name Coverage
  Test
failed #1012
test-all

01:00:01

 
Name Stage Failure
failed
test-all Test The script exceeded the maximum execution time set for the job
  GEN      lisp/international/ccl-tests.log
ELC lisp/international/mule-tests.elc
GEN lisp/international/mule-tests.log
ELC lisp/international/mule-util-tests.elc
GEN lisp/international/mule-util-tests.log
ELC lisp/international/ucs-normalize-tests.elc
GEN lisp/international/ucs-normalize-tests.log
Pulling docker image gitlab/gitlab-runner-helper:x86_64-f100a208 ...
ERROR: Job failed: execution took longer than 1h0m0s seconds