Correct readelf e_shstrndx range check

Correct readelf e_shstrndx range check

Fixes a bogus out of range error:
  Number of section headers:         0 (210016)
  Section header string table index: 1 <corrupt: out of range>

Caused due to e_shnum remaining as zero rather than being updated to
the value from section_header[0].sh_info at the point where we range
check e_shstrndx.

	* readelf.c (process_file_header): Assign updated values from
	section_header[0] fields to e_phnum, e_shnum and e_shstrndx
	during printing of header.  Correct e_shstrndx range check.
	Remove unnecessary casts and use %u rather than %ld for
	unsigned int header fields.  Don't print a random %lx when
	reporting an unknown EI_VERSION.