[v3 patch] Fix some Filesystem TS operations

[Jonathan Wakely]

On 15/05/15 19:37 +0100, Jonathan Wakely wrote:
>Testing revealed a few bugs in how I handled paths that don't exist.
>The new __gnu_test::nonexistent_path() function is a bit hacky but
>should be good enough for the testsuite.

This makes it even hackier but avoids linker warnings for using the
evil tempnam() function.

I know it should use snprintf not sprintf, but that depends on
_GLIBCXX_USE_C99 which may not be defined (because we incorrectly test
for a C99 lib using -std=gnu++98, which I'm going to fix).

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