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/

Move ELF feature note tool to usr.bin/elfctl

elfctl is a tool for modifying the NT_FREEBSD_FEATURE_CTL ELF note,
which contains a set of flags for enabling or disabling vulnerability
mitigations and

Move ELF feature note tool to usr.bin/elfctl

elfctl is a tool for modifying the NT_FREEBSD_FEATURE_CTL ELF note,
which contains a set of flags for enabling or disabling vulnerability
mitigations and other features.

Reviewed by: csjp, kib
MFC after: 2 weeks
Relnotes: Yes
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D23910

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Add tool to modify ELF binary feature control bits

This will allow feature control bits (e.g. for ASLR, PROT_MAX) to be
inspected or modified.

Some clean-up and additional work is likely still requ

Add tool to modify ELF binary feature control bits

This will allow feature control bits (e.g. for ASLR, PROT_MAX) to be
inspected or modified.

Some clean-up and additional work is likely still required, but we can
iterate on this in the tree.

Submitted by: Bora Özarslan <borako.ozarslan@gmail.com>
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D19290

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