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

libarchive: merge from vendor branch

Libarchive 3.7.3

New features:
#1941 uudecode filter: support file name and file mode in raw mode
#1943 7-zip reader: translate Windows permissions into UNI

libarchive: merge from vendor branch

Libarchive 3.7.3

New features:
#1941 uudecode filter: support file name and file mode in raw mode
#1943 7-zip reader: translate Windows permissions into UNIX
permissions
#1962 zstd filter now supports the "long" write option
#2012 add trailing letter b to bsdtar(1) substitute pattern
#2031 PCRE2 support
#2054 add support for long options "--group" and "--owner" to tar(1)

Security fixes:
#2101 Fix possible vulnerability in tar error reporting introduced
in f27c173

Important bugfixes:
#1974 ISO9660: preserve the natural order of links
#2105 rar5: fix infinite loop if during rar5 decompression the last
block produced no data
#2027 xz filter: fix incorrect eof at the end of an lzip member
#2043 zip: fix end-of-data marker processing when decompressing zip
archives

PR: 278315 (exp-run)
MFC after: 1 week

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Remove $FreeBSD$: one-line sh pattern

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

unzip: swtich to bsdunzip from libarchive

Unzip from FreeBSD has been ported to libarchive.
Change usr.bin/unzip to use bsdunzip from libarchive.

Differential Revision: https://reviews.freebsd.org/

unzip: swtich to bsdunzip from libarchive

Unzip from FreeBSD has been ported to libarchive.
Change usr.bin/unzip to use bsdunzip from libarchive.

Differential Revision: https://reviews.freebsd.org/D41239
PR: 272845 (exp-run)
MFC after: 1 month

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