FreeBSD_HEAD_i386 - Build #3325 - Fixed

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FreeBSD_HEAD_i386 - Build #3325 - Fixed:

Build information: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_i386/3325/
Full change log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_i386/3325/changes
Full build log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_i386/3325/console

Change summaries:

301478 by gnn:
Add missing constants from RFCs 4443 and 6550

301477 by bdrewery:
legacy: Avoid building/installing headers twice.

Sponsored by:	EMC / Isilon Storage Division

301476 by bdrewery:
Use the in-tree sys/elf_common.h

This is the same fix as r301471.

301475 by bdrewery:
Regenerate