[PATCH] Fix "FIXME" in libclang-Python bindings test of TranslationUnit.

[BG]

Hello all,

This patch remedies a "FIXME" comment left in a test for the
libclang-Python bindings.

The patch uses a Python standard library module to create a temporary file,
instead of doing so manually. It also no longer deletes files "just in
case", since the possibility of name collision is negligible.

This is my first time sending a patch, but hopefully not the last; please
let me know if there's anything I should be aware of when submitting
patches in the future. Thank you!

- Brian Gesiak
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