Fix compilation with CHECK_STRUCTS

* src/pdumper.c (dump_buffer): Update hash of struct buffer.
1 job for master in 90 minutes and 1 second (queued for 2 seconds)
Status Job ID Name Coverage
  Test
failed #3410
test-all

01:30:01

 
Name Stage Failure
failed
test-all Test The script exceeded the maximum execution time set for the job
  ELC      lisp/rot13-tests.elc
GEN lisp/rot13-tests.log
ELC lisp/scroll-lock-tests.elc
GEN lisp/scroll-lock-tests.log
ELC lisp/ses-tests.elc
GEN lisp/ses-tests.log
ELC lisp/shadowfile-tests.elc
Pulling docker image gitlab/gitlab-runner-helper:x86_64-d0b76032 ...
ERROR: Job failed: execution took longer than 1h30m0s seconds