<elf.h> should make it easier to port our ELF-related tools to other Unices.

For the moment it only includes <sys/exec_elf.h> but the goal is to
stop pulling it directly and also replace <elf_abi.h>

<elf.h> should make it easier to port our ELF-related tools to other Unices.

For the moment it only includes <sys/exec_elf.h> but the goal is to
stop pulling it directly and also replace <elf_abi.h> at least for
base applications.

ok deraadt@, jasper@, naddy@

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