Display unknown notes. Decode NT_GNU_HWCAP notes.

Display unknown notes.  Decode NT_GNU_HWCAP notes.

	* readelf.c (apply_relocations): Fail if the symbol table section
	linked to by the reloc section does not have either the SHT_SYMTAB
	or SHT_DYNSYM type.
	(print_gnu_note): Decode the contents of NT_GNU_HWCAP notes.
	Print the contents of unknown note types.
	(process_note): Add the file and section to the parameter list.
	Use print_symbol to display the note name.
	Display the contents of unknown note types.
	(process_corefile_note_segment): Rename to process_notes_at.
	Add section parameter.  Apply relocations to the notes when
	loading from a section.  Display section name when processing
	notes in a section.
	* testsuite/binutils-all/readelf.n: Update expected output.