[Snek] [PATCH] Close FILE handles with fclose(), as reported by Valgrind

[Keith Packard]

Rhys Kidd <rhyskidd at gmail.com> writes:

> Whilst normal program exit will see open files closed by the operating system,
> this is both an implementation detail that may not hold everywhere and leads
> to unnecessary message reports in a Valgrind run of snek's test suite.

Thanks for your three patches; I've merged them to master.

-- 
-keith
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