Use libc provided sync function

In order to flush file system level buffers to disk we use the sync
function. The way we made this function known to the crate was by
explicitly declaring it as extern "C" and linking against libc. However,
given that we already (indirectly) depend on libc through the nitrokey
crate (and that is unlikely to change) we may as well make libc a direct
dependency and invoke the function through the crate.
Given that the libc crate is available for a variety of platforms, it
seems likely that its approach to interfacing with the system libc
library is more portable than our hand rolled version.

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