avoid some test-time warnings
Current VMS can handle filenames with spaces.

If they are escaped and on an ODS-5 volume, that is. We
then have to clean up all versions of the files created
by a test we weren't running before.
Bump ExtUtils::Manifest version due to commits 97bae9c5 and bf081550
Version 1.61
Normalize VMS case handling in ExtUtils::Manifest.

Both manifind and maniread were not completely matching filesystem
behavior when downcasing filenames.
Version 1.62