Comment 3 for bug 1176337

A proper fix is harder than it seems: there is no tag in metadata that
keeps track of stat(2) st->st_nlink found in the build root.

Instead, RPMTAG_FILEINODES is used to compute the no. of hardlinks.

There are bigger problems with space calculation than not accounting
for hardlink sizes, mostly due to 5% root reserved space estimation.

Finally the error message is difficult to understand because of "needs"
ised in the sense of "... needs an additional ..." amount of space beyond
what is thought to be available (with a heuristic/imperfect adjustment to
account for root reserved space).