Remove residual blank line at start of Makefile

This is a residual of the $FreeBSD$ removal.

MFC After: 3 days (though I'll just run the command on the branches)
Sponsored by: Netflix

Remove $FreeBSD$: one-line sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

EFI secure boot VECTX related changes

When VECTX is enabled as a kernel option and non-EFI loaders are
built, many reads will fail due to the mis-match of whether
LOADER_VERIEXEC_VECTX or not in rea

EFI secure boot VECTX related changes

When VECTX is enabled as a kernel option and non-EFI loaders are
built, many reads will fail due to the mis-match of whether
LOADER_VERIEXEC_VECTX or not in readin.h. Source that includes
bootstrap.h must ensure the kernel option agrees with the compile
time CFLAGS in the various make related files.

Submitted by: bret_ketchum@dell.com (original revision)
Reviewed by: sjg, bdrewery, dab, bret_ketchum@dell.com
MFC after: 1 week
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D29993

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Eliminate bsd.stand.mk and -fPIC 32-bit intel builds

OK. We don't really need a bsd.stand.mk, and it was causing a -fPIC
for the toolchain to be added (bogusly) when building on amd64. Pull
all rele

Eliminate bsd.stand.mk and -fPIC 32-bit intel builds

OK. We don't really need a bsd.stand.mk, and it was causing a -fPIC
for the toolchain to be added (bogusly) when building on amd64. Pull
all relevant defs back into defs.mk and delete bsd.stand.mk.

This saves about 15-20k on i386 loader and zfsloader which when
combined with Lua give us a lot more stack space in those constrained
environments.

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Centralize several variables.

MK_CTF, MK_SSP, MK_PROFILE, NO_PIC, and INTERNALLIB are always the
same, so set them in defs.mk. MAN= is common, so set it here too.
This removes a lot of boring repeti

Centralize several variables.

MK_CTF, MK_SSP, MK_PROFILE, NO_PIC, and INTERNALLIB are always the
same, so set them in defs.mk. MAN= is common, so set it here too.
This removes a lot of boring repetition from the Makefiles that added
almost no value.

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libfdt: Update to 1.4.6, switch to using libfdt for overlay support

libfdt highlights since 1.4.3:

- fdt_property_placeholder added to create a property without specifying its
value at creation tim

libfdt: Update to 1.4.6, switch to using libfdt for overlay support

libfdt highlights since 1.4.3:

- fdt_property_placeholder added to create a property without specifying its
value at creation time
- stringlist helper functions added to libfdt
- Improved overlay support
- Various internal cleanup

Also switch stand/fdt over to using libfdt for overlay support with this
update. Our current overlay implementation works only for limited use cases
with overlays generated only by some specific versions of our dtc(1). Swap
it out for the libfdt implementation, which supports any properly generated
overlay being applied to a properly generated base.

This will be followed up fairly soon with an update to dtc(1) in tree to
properly generate overlays.

MFC note: the <stdlib.h> include this update introduces in libfdt_env.h is
apparently not necessary in the context we use this in. It's not immediately
clear to me the motivation for it being introduced, but it came in with
overlay support. I've left it in for the sake of accuracy and because it's
not harmful here on HEAD, but MFC'ing this to stable/11 will require
wrapping the #include in an `#ifndef _STANDALONE` block or else it will
cause build failures.

Tested on: Banana Pi-M3 (ARMv7)
Tested on: Pine64 (aarch64)
Tested on: PowerPC [nwhitehorn]
Reviewed by: manu, nwhitehorn
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D13893

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Merge ^/head r325999 through r326131.

Move some more common stuff up to Makefile.inc. In particular, the no
simd / no float stuff is centeralized here. Also centralise
-ffreestanding since it is specified everywhere.

This, along with a

Move some more common stuff up to Makefile.inc. In particular, the no
simd / no float stuff is centeralized here. Also centralise
-ffreestanding since it is specified everywhere.

This, along with a change to share/mk/bsd.cpu.mk to include -mno-avx2
in CFLAGS_NO_SIMD should fix building for newer machines (eg with
CPUTYPE=haswell) where clang was generating avx2 instructions.

Sponsored by: Netflix

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Merge ^/head r325663 through r325841.

Move sys/boot to stand. Fix all references to new location

Sponsored by: Netflix