Bug fix update for cvs2fossil

The new snapshot of cvs2fossil fixes two issues seen in the NetBSD repositories:

  1. The vendor branch is sometimes lagging a few seconds behind the 1.1 revision, so apply some fudge.
  1. Path names with spaces were not escaped. This broke NetBSD src after the LLVM import.

Both changes have been in use for the NetBSD conversions for a while.