Expect :floatunditf to fail on FreeBSD/i386

The precision error on FreeBSD/i386 doesn't match the expected output in
long double form.

MFC after: 1 week
Sponsored by: Dell EMC Isilon

Import proper fix for misc/49356 (/usr/include/atf-c/config.h) after atf-c/config.h
was removed from the build

Pointyhat to: me (again, for not running make delete-old after running test builds)

Import the NetBSD test suite from ^/vendor/NetBSD/tests/09.30.2014_20.45 ,
minus the vendor Makefiles

Provide directions for how to bootstrap the vendor sources in
FREEBSD-upgrade

MFC after 2 weeks

Import the NetBSD test suite from ^/vendor/NetBSD/tests/09.30.2014_20.45 ,
minus the vendor Makefiles

Provide directions for how to bootstrap the vendor sources in
FREEBSD-upgrade

MFC after 2 weeks
Discussed with: rpaulo
Sponsored by: EMC / Isilon Storage Division

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