Default WARNS to 0 still, since there's still some warnings on other
architectures.
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Differential Revision: https://reviews.freebsd.org/D13301
These prototypes were needlessly different from the standard. Fix them
to be the same, and fix the surrounding code after the changes.
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Move kernel includes and libsa includes together at the top of defs.mk
Move all machine specific defines from Makefile.inc to their friends
in defs.mk.
Add comments and remove now useless junk after the move.
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