Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with: pfg
MFC After: 3 days
Sponsored by: Netflix

uefisign: fix SizeOfHeaders sanity check.

This check was too aggressive: it is fine if SizeOfHeaders is exactly
equal to the size of the DOS stub + PE header + section table. Despite
being wrong this code typically worked for most EFI binaries because
SizeOfHeaders is rounded up to a multiple of FileAlignment, which is
often large (e.g., 512 bytes for the FreeBSD loader) so most binaries
made it through.

Reviewed by: imp@
Sponsored by: Netflix
Pull Request: https://github.com/freebsd/freebsd-src/pull/445

uefisign: handle empty sections

loader.efi has an empty set_Xfic section. Handle it correctly.

```
Sections:
Idx Name Size VMA LMA File off Algn
[...]
3 set_Xcom 00000168 00000000000d4000 00000000000d4000 000d0e00 2**2
CONTENTS, ALLOC, LOAD, DATA
4 set_Xfic 00000000 00000000000d4168 00000000000d4168 00000000 2**2
ALLOC, LOAD, DATA
5 .sdata 00000448 00000000000d5000 00000000000d5000 000d1000 2**2
CONTENTS, ALLOC, LOAD, DATA
[...]
```

Reviewed by: trasz, dab
Reported by: andy.y.liu@dell.com
Tested by: andy.y.liu@dell.com
MFC after: 1 week
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D29606

Drop "All rights reserved" from all my stuff. This includes
Foundation copyrights, approved by emaste@. It does not include
files which carry other people's copyrights; if you're one
of those people, feel free to make similar change.

Reviewed by: emaste, imp, gbe (manpages)
Differential Revision: https://reviews.freebsd.org/D26980

Fix alignment issue in uefisign

The pe_certificate structure has to be aligned to 8 bytes. [1]
Since this is now checked in edk2, any binaries signed with
older version of this tool will fail verification.

References:
[1] https://docs.microsoft.com/en-us/windows/desktop/Debug/pe-format#the-attribute-certificate-table-image-only

Submitted by: Kornel Duleba <mindal@semihalf.com>
Reviewed by: trasz
Obtained from: Semihalf
Sponsored by: Stormshield
Differential Revision: https://reviews.freebsd.org/D18554

Add SPDX identifiers for uefisign(8) sources.

MFC after: 2 weeks

Fix a ton of speelling errors

arc lint is helpful

Reviewed By: allanjude, wblock, #manpages, chris@bsdjunk.com
Differential Revision: https://reviews.freebsd.org/D3337

Remove the warning about invalid PE checksum; apparently nothing
cares about those checksums anyway.

MFC after: 1 month
Sponsored by: The FreeBSD Foundation

Add uefisign(8), UEFI Secure Boot signing utility.

MFC after: 1 month
Sponsored by: The FreeBSD Foundation