[PATCH] Do not delete make check-abi symlist files

[Roland McGrath]

That's not what you want.  .PRECIOUS with actual file names prevents those
from being deleted on interrupt, which is bad.  .PRECIOUS with the target
pattern of an implicit rule prevents files from being intermediate files.
i.e.:

.PRECIOUS: %.symlist

Also, end a sentence in a comment with a period.


Thanks,
Roland