Merged revisions 62149, 62153, 62154 via svnmerge from

svn+ssh://pythondev@svn.python.org/python/trunk

Sync with files from the just released libffi 3.0.5 version.

More files from libffi 3.0.5.
Removed libffi.pc.in because it is not needed for ctypes.

News entry for: Sync with files from the just released libffi 3.0.5 version.