Instead of relaying on stddef.h being included by other headers
let's include it explicitly, following a report of it being
missing for Ubuntu 22.04 (glibc 2.35)
Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>
Split the fuse FS driver into 2 parts: A top built in the embedded side,
with the embedded libC, and a bottom built in the runner side with the
host libC.
The error returns are converted to match the host libC.
Also, before the host FUSE thread, which is asynchronous to Zephyr was
calling directly into the Zephyr filesystem code, which resulted quite
often if catastrophic failures or corruption of the Zephyr state.
This is now fixed by having the FUSE thread queue requests to a Zephyr
thread, which will be handled in the embedded side in a coherent way.
This adds a slightly noticeable overhead, but the performance is still
acceptable.
Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>
