get rid of dictionary comprehensions

for Python 2.6 compatibility

beets/library.py

@@ -955,7 +955,9 @@ class Results(object):
                     (row['id'],)
                 )
             values = dict(row)
-            values.update({row['key']: row['value'] for row in flex_rows})
+            values.update(
+                dict((row['key'], row['value']) for row in flex_rows)
+            )
 
             # Construct the Python object and yield it if it passes the
             # predicate.

beetsplug/mbsync.py

@@ -93,7 +93,7 @@ def mbsync_albums(lib, query, move, pretend, write):
             continue
 
         items = list(a.items())
-        old_data = {item: dict(item) for item in items}
+        old_data = dict((item, dict(item)) for item in items)
 
         # Get the MusicBrainz album information.
         album_info = hooks.album_for_mbid(a.mb_albumid)