Fix theoretical issue in filecommit.

If the file was copied, we don't want to reuse the original entry.

I think this is mostly a theoretical issue - when there are copies,
fp1 == nullid, so it's very unlikely that the fl.cmp(fp1, t) would
think the file was unmodified.  In any case, if there was a copy,
we should forcefully create a new entry.

mercurial/localrepo.py

@@ -626,7 +626,7 b' class localrepository(repo.repository):'
                 fp2 = nullid
 
         # is the file unmodified from the parent? report existing entry
-        if fp2 == nullid and not fl.cmp(fp1, t):
+        if fp2 == nullid and not fl.cmp(fp1, t) and not meta:
             return fp1
 
         changelist.append(fn)