The ModifiedFileIndexer updates the timestamps, which has the effect
the XAttr indexer will not pick up any XAttr changes later when both
happen at approximately the same time.

In case the file metadata has changed, also update everything associated
to the ctime (XAttrs, filename). This also has the nice side effect
of getting rid of a separate BasicIndexingJob run later.

Depends on D21694.

1. touch testfile; sleep 10
2. setfattr -n baloo.file.rating -v 4 ; touch testfile

After the change, balooshow testfile shows the rating.