MDEV-26674 follow-up: Bless Linux 5.15.3

In commit 1193a793 we
set innodb_use_native_aio=OFF when using io_uring
on a kernel where write requests could potentially be lost.

The last reproducible issue was fixed in Linux 5.16-rc1
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=v5.16-rc1&id=d3e3c102d107bb84251455a298cf475f24bab995
and the fix was backported to 5.15.3.

Hence, using a 5.16 or later kernel should be fine.
The Debian kernel 5.15.0-1-amd64 (5.15.3-1) was tested.
On Debian, utsname::release or uname -r does not reflect the
exact minor version while utsname::version and uname -v does.

On Fedora however the utsname::version is rather different:

  $ uname -r
  5.14.20-200.fc34.x86_64
  $ uname -v
  #1 SMP Thu Nov 18 22:03:20 UTC 2021

As such we use the version, but fall back to the release if
there isn't the beginnings of a kernel version in the version.

Thanks to Daniel Black for reporting the Linux kernel bug and
Jens Axboe for actually fixing it.
Co-Authored-By: Daniel Black <daniel@mariadb.org>

Closes: #1953

storage/innobase/handler/ha_innodb.cc

@@ -19396,8 +19396,15 @@ bool innodb_use_native_aio_default()
 #ifdef HAVE_URING
   utsname &u= uname_for_io_uring;
   if (!uname(&u) && u.release[0] == '5' && u.release[1] == '.' &&
-      u.release[2] == '1' && u.release[3] > '0' && u.release[3] < '6')
+      u.release[2] == '1' && u.release[3] >= '1' && u.release[3] <= '5' &&
+      u.release[4] == '.')
   {
+    if (u.release[3] == '5') {
+      const char *s= strstr(u.version, "5.15.");
+      if (s || (s= strstr(u.release, "5.15.")))
+        if ((s[5] >= '3' || s[6] >= '0'))
+          return true; /* 5.15.3 and later should be fine */
+    }
     io_uring_may_be_unsafe= u.release;
     return false; /* working around io_uring hangs (MDEV-26674) */
   }