[RFA] Improve ELF OSABI detection

[Mark Kettenis]

   Index: ChangeLog
   from  Mark Kettenis  <kettenis@gnu.org>

	   * osabi.c (generic_elf_osabi_sniffer): Add check for FreeBSD 3.x's
	   traditonal string branding within the ELF header.

Well, since nobody complained, and it seems that there is no specific
maintainer for osabi.c, I checked this in.  I really want to make some
other changes to that file :-).

Mark