pptok.pl: don't leak internal codes into pptok.c
pptok.pl: don't leak internal codes into pptok.c

If we have internal codes in pptok.c, we may have false matches for
them as tokens, plus, there is no reason for them to exist there. Go
back to putting NULL in those slots.

Signed-off-by: H. Peter Anvin (Intel) <8a453bad9912ffe59bc0f0b8abe03df9be19379e@zytor.com>

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