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2021-01-31T04:33:23.531088Z
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MFC: 83edbc3cb54fba6b37a68270c232df7b785bd222

ipfilter: Retire pre-standard C support.

All C compilers in 2021 support standard C and architectures that did
not were retired long ago. Simplify by removing now redundant
pre-standard C code.

MFC after:	1 week

(cherry picked from commit 83edbc3cb54fba6b37a68270c232df7b785bd222)

Git Hash:   35e09fbfc492e8fac3dd7ebdb21a52942ecd5384
Git Author: cy@FreeBSD.org
END