Joerg Wunsch 1a5d6f5e0b Implement VJ header compression for sppp.
This is the logical merge of rev 1.32 of i4b's old if_spppsubr.c (which
was based on PR misc/11767), plus (i4b) rev 1.6 of i4b's if_ispppsubr.c,
albeit with numerous stylistic and cosmetic changes.

PR:		misc/11767
Submitted by:	i4b, Joachim Kuebart
MFC after:	1 month
2001-12-27 16:49:31 +00:00
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