We have a couple of functions that are unused (for now) by design.
Although at least one has a flag so that gcc doesn't warn, cppcheck has its
own warnings about this.  Add specific inline suppressions for these rather
than a blanket suppression in the Makefile.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

Unions and structs, you all have names now.

Take the chance to enable bugprone-reserved-identifier,
cert-dcl37-c, and cert-dcl51-cpp checkers in clang-tidy.

Provide a ffsl() weak declaration using gcc built-in.

Start reordering includes, but that's not enough for the
llvm-include-order checker yet.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

SPDX tags don't replace license files. Some notices were missing and
some tags were not according to the SPDX specification, too.

Now reuse --lint from the REUSE tool (https://reuse.software/) passes.

Reported-by: Martin Hauke <mardnh@gmx.de>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

List of allowed syscalls comes from comments in the form:
	#syscalls <list>

for syscalls needed both in passt and pasta mode, and:
	#syscalls:pasta <list>
	#syscalls:passt <list>

for syscalls specifically needed in pasta or passt mode only.

seccomp.sh builds a list of BPF statements from those comments,
prefixed by a binary search tree to keep lookup fast.

While at it, clean up a bit the Makefile using wildcards.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

...just so that links are not broken for the moment being.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>