largefiles: ensure destination directory exists before findfile links to there

When (1) findfile links a largefile from the user cache to the store
and (2) the store directory doesn't exist yet, findfile errors out. A
simple call to util.makedirs fixes it.

hgext/largefiles/lfutil.py

@@ -110,7 +110,9 b' def findfile(repo, hash):'
         repo.ui.note(_('Found %s in store\n') % hash)
     elif inusercache(repo.ui, hash):
         repo.ui.note(_('Found %s in system cache\n') % hash)
-        link(usercachepath(repo.ui, hash), storepath(repo, hash))
+        path = storepath(repo, hash)
+        util.makedirs(os.path.dirname(path))
+        link(usercachepath(repo.ui, hash), path)
     else:
         return None
     return storepath(repo, hash)