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

sys: Remove $FreeBSD$: one-line sh pattern

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

Driver for 4x10Gb Ethernet reference NIC FPGA design for NetFPGA SUME
development board.

Submitted by: Denis Salopek <denis.salopek AT fer.hr>
Reported by: zec, bz (src); rgrimes, bcr (manpages)
MFC

Driver for 4x10Gb Ethernet reference NIC FPGA design for NetFPGA SUME
development board.

Submitted by: Denis Salopek <denis.salopek AT fer.hr>
Reported by: zec, bz (src); rgrimes, bcr (manpages)
MFC after: 7 days
Sponsored by: Google Summer of Code 2020
Differential Revision: https://reviews.freebsd.org/D26074

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