[m-rev.] for post-commit review: explicit stream handling when finding files

[Julien Fischer]

On Tue, 6 Sep 2016, Zoltan Somogyi wrote:

> This fixes an old ZZZ.
>

The diff looks fine.  Related to this I would prefer that all file
stream handling in the compiler be explicit and that this be required
by the coding standard.  Opinions?

Julien.