Fix errno error buffers to not clobber errors

The strerror_r API has two flavors depending on system options.

The bad flavor uses a static buffer for returning results, so if
you save the pointer from strerror_r, the string you're referencing
becomes useless if anybody else calls strerror_r again

The good flavor does what you expect: it writes the error to your buffer.

This commit uses strerror_r directly if it's a good version or copies
the static buffer into our private buffer if it's a bad version.

Thanks to gemorin for explaining the problem and drafting a fix.

Fixes #239

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