FreeBSD/src a2d9549 (r344354)lib/libc/amd64 Symbol.map, lib/libc/i386 Symbol.map

Add usermode helpers for for Intel userspace protection keys feature.

Reviewed by:    markj
Tested by:      pho
Sponsored by:   The FreeBSD Foundation
MFC after:      2 weeks
Differential revision:  https://reviews.freebsd.org/D18893
DeltaFile
+138-0lib/libc/x86/sys/pkru.c
+7-0lib/libc/amd64/Symbol.map
+7-0lib/libc/i386/Symbol.map
+5-0sys/x86/include/sysarch.h
+2-1lib/libc/x86/sys/Makefile.inc
+159-15 files

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