[Bug 217610] ELF loader should have a special case for program headers with p_filesz == 0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217610

--- Comment #4 from Konstantin Belousov <kib at FreeBSD.org> ---
Created attachment 180607
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=180607&action=edit
Handle filsz == 0.

Attached is the proposed patch.  Note that it is somewhat more involved that
just passing the filsz == 0 in the initial ENOEXEC check, because I do not want
even think what happens when offset is not multiple of the page size.  I just
force any file-backed COW mappings to be avoided if filesz == 0.

Also the patch contains some style cleanup, which I split for actual commit.

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