readelf: add support for QNT_STACK note subsections

readelf: add support for QNT_STACK note subsections

QNX provides some .note subsections. QNT_STACK is the one controling
the stack allocation.

bfd/ChangeLog:

	* elf.c (BFD_QNT_CORE_INFO): Delete.
	(BFD_QNT_CORE_STATUS): Likewise.
	(BFD_QNT_CORE_GREG): Likewise.
	(BFD_QNT_CORE_FPREG): Likewise.
	(elfcore_grok_nto_note): Replace BFD_QNT_* by QNT_*.

binutils/ChangeLog:

	* readelf.c (get_qnx_elfcore_note_type): New function.
	(print_qnx_note): New function.
	(process_note): Add support for QNX support.

include/ChangeLog:

	* elf/common.h (QNT_DEBUG_FULLPATH): New define.
	(QNT_DEBUG_RELOC): New define.
	(QNT_STACK): New define.
	(QNT_GENERATOR): New define.
	(QNT_DEFAULT_LIB): New define.
	(QNT_CORE_SYSINFO): New define.
	(QNT_CORE_INFO): New define.
	(QNT_CORE_STATUS): New define.
	(QNT_CORE_GREG): New define.
	(QNT_CORE_FPREG): New define.
	(QNT_LINK_MAP): New define.