Make it a bit more obvious what actually happens for the tmpdir
fallback.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Honor TMPDIR when picking a place to write mtools.conf.

Check for errors while writing mtools.conf.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Fix a couple of _FORTIFY_SOURCE failures which are nuisance warnings,
but fortunately not too hard to just plain avoid.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

We need to include the size of the ADV in the range of data that needs
to be mapped.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

Create an install an empty ADV.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

Merge the SYSLINUX and EXTLINUX patching code and core code, removing
EXTLINUX as a separate derivative.  All the disk-based systems now use
the same code.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

The previous merging extlinux/syslinux patch is not sufficient, the
syslinux is not real "patchbased", hence:

* fill currentdir in patcharea
* search "extlinux.conf" and "syslinux.cfg" for generic_load_config
* define boot_image and boot_sector macro for ldsyslinux
  this could make further merging extlinux and syslinux possible

Signed-off-by: Alek Du <alek.du@intel.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

Resolved Conflicts:
	com32/Makefile
	com32/include/syslinux/pxe.h
	core/pxelinux.asm
	core/syslinux.ld

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

It's perfectly legitimate to have a bigger FAT area than is needed,
and it is often done for alignment.  Tell mtools not to throw a hissy
fit over it.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Conflicts:
	com32/include/netinet/in.h
	com32/include/sys/cpu.h
	dos/argv.c
	dos/malloc.c
	dos/syslinux.c
	extlinux/main.c
	libinstaller/setadv.c
	libinstaller/syslinux.h
	libinstaller/syslxint.h
	libinstaller/syslxmod.c
	linux/syslinux.c
	mtools/syslinux.c
	win32/syslinux.c

Signed-off-by: H. Peter Anvin <hpa@zytor.com>