Maintaining postject

The postject dependency is used for the Single Executable strategic initiative.

Updating postject

The tools/dep_updaters/update-postject.sh script automates the update of the postject source files.

Check that Node.js still builds and tests.

Committing postject

1. Add postject:

   $ git add test/fixtures/postject-copy
   $ git add deps/postject
   

2. Commit the changes: git commit.

3. Add a message like:

   deps,test: update postject to <version>
   
   Updated as described in doc/contributing/maintaining-postject.md.