fix(leaks): FIX memoryview leak in Windows

+ All gitdb TCs now pass without explit release!

Author: ankostis

smmap/util.py

@@ -22,10 +22,9 @@
 except NameError:
     # Python 3 has no `buffer`; only `memoryview`
     def buffer(obj, offset, size):
-        # Actually, for gitpython this is fastest ... .
-        return memoryview(obj)[offset:offset + size]
-        # doing it directly is much faster !
-        # return obj[offset:offset + size]
+        # Actually, for gitpython this is fastest ... but `memoryviews` LEAK!
+        #return memoryview(obj)[offset:offset + size]
+        return obj[offset:offset + size]
 
 
 PY3 = sys.version_info[0] >= 3