io_uring: make Linux version check runtime instead od comptime

Reverting previous change.
I'm building test bin and then running it in virtual machines with different
kernels. So Linux kernel checks has to be runtime instead of comptime.

lib/std/os/linux/io_uring.zig

@@ -4123,5 +4123,16 @@ test "openat_direct/close_direct" {
 /// For use in tests. Returns SkipZigTest is kernel version is less than required.
 fn skipKernelLessThan(required: std.SemanticVersion) !void {
     if (builtin.os.tag != .linux) return error.SkipZigTest;
-    if (required.order(builtin.os.version_range.linux.range.max) == .gt) return error.SkipZigTest;
+
+    var uts: linux.utsname = undefined;
+    const res = linux.uname(&uts);
+    switch (linux.getErrno(res)) {
+        .SUCCESS => {},
+        else => |errno| return os.unexpectedErrno(errno),
+    }
+
+    const release = mem.sliceTo(&uts.release, 0);
+    var current = try std.SemanticVersion.parse(release);
+    current.pre = null; // don't check pre field
+    if (required.order(current) == .gt) return error.SkipZigTest;
 }