libsa: Remove redundant sys/cdefs.h

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stand: Use modern function definitions

Use modern function definitions for functions with no args.

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Remove $FreeBSD$: one-line .c pattern

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

stand: Use c99 structure initialization for bzipfs_fsops

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libsa: Fix a typo in a panic message

- s/occured/occurred/

MFC after: 3 days

libsa: Fix infinite loop in bzipfs & gzipfs

A bug in the loader's bzipfs & gzipfs filesystems caused compressed
kernel and modules not to work on EFI systems with a veriexec-enabled
loader. Since th

libsa: Fix infinite loop in bzipfs & gzipfs

A bug in the loader's bzipfs & gzipfs filesystems caused compressed
kernel and modules not to work on EFI systems with a veriexec-enabled
loader. Since the size of files in these filesystems are not known
_a priori_ `stat` would initialize the size to -1 and the loader would
then hang in an infinite loop while trying to seek (read) to the end
of file since the loop termination condition compares the current
offset to that negative target position.

Reviewers: vangyzen, imp, Bret Ketchum (Bret.Ketchum@dell.com)
Differential Revision: https://reviews.freebsd.org/D30414
Sponsored by: Dell EMC Isilon
MFC to: stable/12, stable/13
MFC after: 1 week

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Merge ^/head r340918 through r341763.

The libstand's panic() appends its own '\n' to the message, so that users of the API
don't need to supply one.

MFC after: 2 weeks

Merge ^/head r325663 through r325841.

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

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