[Bug 282096] Makefile.inc1 never sets MK_CLEAN to "yes"

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=282096

--- Comment #1 from Ed Maste <emaste@freebsd.org> ---
MK_CLEAN is set by share/mk/src.opts.mk and src.conf(5), and recently switched
to avoid doing clean builds by default. See the 20240729 entry in UPDATING:

20240729:
        The build now defaults to WITHOUT_CLEAN - i.e., no automatic clean
        is performed at the beginning of buildworld or buildkernel.  The
        WITH_CLEAN src.conf(5) knob can be used to restore the previous
        behaviour.

        If you encounter incremental build issues, please report them to the
        freebsd-current mailing list so that a special-case dependency can be
        added, if necessary.

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