FreeBSD/src cb83812 (r316287)lib/libstand nfs.c nfsv2.h, sys/boot/i386/libi386 pxe.c

Remove OLD_NFSV2 from loader and libstand

We have parallel NFSv2 and NFSv3 reader implementations, only configurable at
build time, defaulting to v3. Remove v2.

Reviewed by:    allanjude
Approved by:    allanjude (mentor)
Differential Revision:  https://reviews.freebsd.org/D10206
DeltaFile
+0-675lib/libstand/nfs.c
+0-55sys/boot/i386/libi386/pxe.c
+0-43lib/libstand/nfsv2.h
+0-7733 files

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