[PATCH] check kernel version for io_method

Hello,


Please find a patch proposal for bug BUG #19369: Not documented that 
io_uring on kernel versions between 5.1 and below 5.6 does not work.

This is not  a document patch but code patch using a GUC hook to :

- check liburing setup

- check kernel version

to allow/disallow io_method=io_uring


I have made successfull tests on:

- Alma Linux 9.7/ kernel 5.14 without liburing setup

- Debian 12 / kernel 6.1 with liburing-dev


NB:

This is my first patch and I apologize if it is not fully compliant with 
patching rules.


Thanks.