Update .gitignore

Dependencies

• [2] Y6H7Y3OT Capture the path to `guile', when available.
• [*] GBCPEGYC Add a .gitignore

Change contents

• edit in .gitignore at line 19
  [2.34]
  + /src/sql/hydra-postgresql.sql

  + /src/sql/hydra-sqlite.sql

  + /src/sql/tmp.sqlite

  + /src/c/hydra-eval-jobs

  + /src/root/static/bootstrap

  + /src/root/static/js

  + /doc/manual/images

  + /doc/manual/manual.html

  + /doc/manual/manual.pdf