the file is of no importance or concern relating to the SELinux error message. The file has the wrong SELinux context assigned, as stated in the error message you posted. To see the SELinux context of a file, use the -Z option to the ls command:
BASH:~/-> ls -Z /var/lib/misc/prelink.quick
-rw-r--r--. root root system_u:object_r:prelink_var_lib_t:s0 /var/lib/misc/prelink.quick
When you get those SELinux troubleshoot warnings and the star icon appears on the panel, click on the star to see the information. Go to the most recent incident, or the one that involves the incident you're interested in, and then click on the "see more info" button. Scroll down in that and it will almost always show you the command to "fix" the problem.
In this case you need to relabel the SELinux security context of that file, so the command would be:
sudo chcon -t prelink_var_lib_t /var/lib/misc/prelink.quick
You can also fix SELinux context mislabelled files system wide by doing:
sudo touch /.relabel
then rebooting.... and SELinux will scan the entire file system and apply correct labelling early in the boot process.