Avoid unnecessary consing in project--files-in-directory

* lisp/progmodes/project.el (project--remote-file-names): New function.
(project--files-in-directory): Use it.
1 job for master in 49 minutes and 39 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
failed #751
test-all

00:49:39

 
Name Stage Failure
failed
test-all Test
Makefile:309: recipe for target 'check-doit' failed
make[2]: *** [check-doit] Error 1
make[2]: Leaving directory '/builds/emacs/emacs/test'
make[1]: *** [check-expensive] Error 2
Makefile:284: 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