readelf PT_PHDR check

readelf PT_PHDR check

When PT_PHDR isn't covered by a PT_LOAD header, p_vaddr in PT_PHDR
isn't valid but the value might just pass a vaddr test.  So test
p_offset as well.

	* readelf.c (process_program_headers): Check PT_PHDR p_offset
	as well as p_vaddr.  Use p_filesz, not p_memsz, in vaddr test.