Automatically reformat memdisk/e820func.c using Nindent.

Do this for all files except HDT, gPXE and externally maintained
libraries (zlib, tinyjpeg, libpng).

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

Drop all support for ACPI 3 E820 extended memory attributes.  There
are BIOSes in the field that report completely bogus information here,
resulting in no memory at all being detected (we then fall back to
E801 detection, but that is problematic in its own ways.)

There is strong reasons to believe at this point that the extended
memory attributes are not usable in their current form, so drop them
and revert back to simple 20-byte support, including for MEMDISK
spoofing.

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

Make it possible to build e820test again, to debug the e820 code.

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

Some blithering idiot thought it was a good idea to introduce
"extended attributes" for INT 15h, AX=E820h, and in doing so, breaking
compatibility with ALL E820 users out there.  F*cking morons.
Implement handling of extended attributes in:

- e820 parsing in the core
- e820 parsing in libcom32
- e820 parsing *and proxying* in memdisk

The latter is the really painful one.

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

There are plenty of systems out there with more than 64 e820
descriptors.  The hard-coded limit is only used during initialization,
so we might as well go nuts.