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/

mktemp: add -p/--tmpdir argument

This matches other mktemp implementations, including OpenBSD and GNU.
The -p option can be used to provide a tmpdir prefix for specified
templates. Precedence works

mktemp: add -p/--tmpdir argument

This matches other mktemp implementations, including OpenBSD and GNU.
The -p option can be used to provide a tmpdir prefix for specified
templates. Precedence works out like so:

-t flag:
- $TMPDIR
- -p directory
- /tmp

Implied -t flag (no arguments or only -d flag):
- -p directory
- $TMPDIR
- /tmp

Some tests have been added for mktemp(1) in the process.

Reviewed by: imp (earlier version), wosch
Sponsored by: Klara, Inc.
Differential Revision: https://reviews.freebsd.org/D37121

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