Enable IO_URING for RHEL
While RHEL 9 has been running with IO_URING disabled, upstream did not want to remove the config EXPERT gating because "in the future it is assumed that IO_URING is enabled everywhere". It seems that future has come, and with 6.4, we can not build with IO_URING disabled. The easy solution is to turn IO_URING back on for RHEL. If this is not acceptable, someone would need to fix the build issues with 6.4 and IO_URING disabled.
Signed-off-by: Justin M. Forbes jforbes@fedoraproject.org