Make test_patches use patch -E

because it needs it, and I thought it had it, but apparently doesn't
Apply the perl patch for CVS-2014-4330

Pointed out that it was missing by Nigel Taylor

I did crank the version number with an _01 as he suggested, tho the _
often indicates a "development" version, so perhaps this will need
revisiting.
Roll library versions for 5.20.1 import
If set, skip cvs add/rm of things in the files directory

Because we don't need to remove and re-add them