Report progress during custom-make-dependencies instead of file count

* lisp/cus-dep.el (custom-make-dependencies): Rewrite to use
reporter to report progress instead of how many files we've
processed.

* lisp/emacs-lisp/byte-run.el (byte-compile-info-string): New function.
(byte-compile-info-message): Use it.
1 job for master in 90 minutes (queued for 2 seconds)
Status Job ID Name Coverage
  Test
failed #2265
test-all

01:30:00

 
Name Stage Failure
failed
test-all Test The script exceeded the maximum execution time set for the job
make -C test check-expensive
make[1]: Entering directory '/builds/emacs/emacs/test'
rm -f ./*.tmp
make[2]: Entering directory '/builds/emacs/emacs/test'
make[3]: Entering directory '/builds/emacs/emacs/test'
ELC lisp/net/tramp-tests.elc
GEN lisp/net/tramp-tests.log
Pulling docker image gitlab/gitlab-runner-helper:x86_64-f100a208 ...
ERROR: Job failed: execution took longer than 1h30m0s seconds