GC and file descriptors (and external resources.in general, I guess)

[Michael Livshin]

hello everybody.

currently, if a call to `open' or `opendir' fails, Guile throws an
error.

what it *should* do, IMHO, is try to GC first, since it is likely to
free some file descriptors.

so, well, is there any reason why this isn't done?  if there's no good 
reason, I'll add this functionality.

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