Proposed elf header changes which affect PPC and ARM

[Joseph Koshy]

> The patch: <http://people.freebsd.org/~jb/elf.patch> moves
> all the relocation definitions for each arch from the machine/elf.h
> header to sys/elf_common.h.

What's the semantic difference between an 'Lword' and an 'Xword'?

+ typedef uint64_t	Elf32_Lword;

and...

  typedef int32_t		Elf64_Sword;
  typedef int64_t		Elf64_Sxword;
  typedef uint32_t	Elf64_Word;
+ typedef uint64_t	Elf64_Lword;
  typedef uint64_t	Elf64_Xword;

  /*

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