[Bug 275030] buildworld fails if obj dir is NFS-mounted [patch]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=275030

--- Comment #4 from Jessica Clarke <jrtc27@freebsd.org> ---
commit 0e533c72bc300bd90390e950ea9e473b38eeb409
Author: Warner Losh <imp@FreeBSD.org>
Date:   Mon Aug 24 16:06:11 2020 +0000

    When copying over the binaries, use '-p' to preserve date/time

    Although I can't reproduce it, others are seeing different lex/yacc
    programs always regenerated after my change to copy rather than
    symlink the files. The reported fix is to add '-p' to the copies.
    Since it doesn't hurt, go head and add it, though the reasons for
    this mattering remain at best obscure and poorly articulated.

Notes:
    svn path=/head/; revision=364701

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