[RFA] elfcore.h: Set arch before processing phdrs

[Nick Clifton]

Hi Jason,

> The following change fixes a problem reading NetBSD ELF core files 
> on Alpha and SPARC systems.
> 
> OK to commit?
> 
> 	* elfcore.h (elf_core_file_p): Set the machine architecture
> 	before processing the program headers.

Approved - please apply.

Can you also add a comment indicating why it is necessary to set the
machine architecture first, so that someone in the future is not
tempted to switch them back.

Cheers
        Nick