make-target-2-load.lisp: add :ucrt to public features

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:ucrt is detected at build time (via tools-for-build/ucrt-test.c) and used
as a reader conditional in several places, but it is missing from the
public-features whitelist in make-target-2-load.lisp and therefore stripped
from *features* before the core is saved.

This means the feature does not work as intended when it matters most:
contribs are built using the saved core, so #+ucrt/#-ucrt conditions in
contrib code (currently sb-posix/constants.lisp and
sb-posix/interface.lisp) are never taken.

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<div dir=3D"ltr">:ucrt is detected at build time (via tools-for-build/ucrt-=
test.c) and used as a reader conditional in several places, but it is missi=
ng from the public-features whitelist in make-target-2-load.lisp and theref=
ore stripped from *features* before the core is saved.<br><br><div>This mea=
ns the feature does not work as intended when it matters most: contribs are=
 built using the saved core, so #+ucrt/#-ucrt conditions in contrib code (c=
urrently sb-posix/constants.lisp and sb-posix/interface.lisp) are never tak=
en.</div><div><br></div><div><br></div></div>

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