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testhelper: Fix ETXTBSY when running just-written executables

Patrick Steinhardt requested to merge pks-testhelper-flush-written-executables into master

Somehow we're getting ETXTBSY errors when executing executables which we have just written via WriteExecutable(). This doesn't make all that much sense: the file is created atomically with the correct executable bits and closed as expected. So this rather seems like an OS-level bug.

Let's try to fix this by explicitly syncing the file to disk.

Closes #4018 (closed)

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