Cleanup preserved lib locking in portage.

pym/_emerge/main.py

 # Copyright 1999-2011 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 
 from __future__ import print_function
 
 import logging
 import signal
 import stat
 import sys
 import textwrap
@@ skipping 199 matching lines @@
                                         out.einfo("Processed %d info files." % (icount,))
 
 def display_preserved_libs(vardbapi, myopts):
         MAX_DISPLAY = 3
 
         if vardbapi._linkmap is None or \
                 vardbapi._plib_registry is None:
                 # preserve-libs is entirely disabled
                 return
 
-        # Ensure the registry is consistent with existing files.
-        vardbapi._plib_registry.pruneNonExisting()
-
         if vardbapi._plib_registry.hasEntries():
                 if "--quiet" in myopts:
                         print()
                         print(colorize("WARN", "!!!") + " existing preserved libs found")
                         return
                 else:
                         print()
                         print(colorize("WARN", "!!!") + " existing preserved libs:")
 
                 plibdata = vardbapi._plib_registry.getPreservedLibs()
@@ skipping 1581 matching lines @@
                         return 1
 
                 if "--pretend" not in myopts:
                         display_news_notification(root_config, myopts)
                 retval = action_build(settings, trees, mtimedb,
                         myopts, myaction, myfiles, spinner)
                 post_emerge(myaction, myopts, myfiles, settings["ROOT"],
                         trees, mtimedb, retval)
 
                 return retval