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/

md5: Improve compatibility.

* Overhaul the GNU compatibility mode to more closely emulate what the GNU tools do.

* Add a Perl compatibility mode which emulates the shasum tool that ships with Perl.

md5: Improve compatibility.

* Overhaul the GNU compatibility mode to more closely emulate what the GNU tools do.

* Add a Perl compatibility mode which emulates the shasum tool that ships with Perl. This is currently not installed.

* Overhaul the tests.

Sponsored by: Klara, Inc.
Reviewed by: kevans
Differential Revision: https://reviews.freebsd.org/D39446

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md5: fix *sum -c with missing files

If we fail to open one of the files in the file listing, we still need
to advance `rec` along with `argv` so that the checksum we're checking
against lines up wit

md5: fix *sum -c with missing files

If we fail to open one of the files in the file listing, we still need
to advance `rec` along with `argv` so that the checksum we're checking
against lines up with the file we're hashing.

Tests added both for the -c flag, as well as the -b and -t modes of
the *sum programs.

PR: 267722
Reviewed by: emaste (earlier version)
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D37374

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sbin/md5: improve compatibility with coreutils -c option

The -c option expects a digest file in either BSD or coreutils format.

The output for matched and mismatched files is identical to that
of t

sbin/md5: improve compatibility with coreutils -c option

The -c option expects a digest file in either BSD or coreutils format.

The output for matched and mismatched files is identical to that
of the coreutils version.

The review of these changes included test cases that have already
been committed for the functionality that existed before.
Another test script is added to cover the coreutils compatible
extension implemented by this patch.

This commit contains a tests/Makefile that has been cleaned up
compared to the review version, using an implicit rule to apply the
TESTBASE path at build time (and the scripts have been renamed to
have an extension of .SH instead of .sh to trigger this rule).

Reviewed by: imp
Differential Revision: https://reviews.freebsd.org/D30812

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sbin/md5: add tests

While the correctness of the supported hash algorithms can be tested
with the built-in self-test feature, these test cases are meant to
detect changes in the output format.

A fo

sbin/md5: add tests

While the correctness of the supported hash algorithms can be tested
with the built-in self-test feature, these test cases are meant to
detect changes in the output format.

A follow-up commit will improve the compatibility with the coreutils
versions of the hash programs, and these tests should detect any
unintended side-effects of such a change on existing functionality.

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