log: Allow disabling of stdio

Some firmwares (e.g. Hostboot) don't provide stdio.h. Make sure we can
compile in these environments.

Signed-off-by: Andrew Jeffery <andrew@aj.id.a

log: Allow disabling of stdio

Some firmwares (e.g. Hostboot) don't provide stdio.h. Make sure we can
compile in these environments.

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Change-Id: I3a5f414f12fbf9de70fb41033d610f81094848bf

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LICENSE: add GPLv2 license option.

As per the MCTP design document
(https://github.com/openbmc/docs/blob/master/designs/mctp.md), a
dual-licence (GPLv2+ and Apache-2.0) gives us flex

LICENSE: add GPLv2 license option.

As per the MCTP design document
(https://github.com/openbmc/docs/blob/master/designs/mctp.md), a
dual-licence (GPLv2+ and Apache-2.0) gives us flexibility with including
libcmtp code into various firmware environments.

This change adds GPLv2+ as a license option. All current contributors
have agreed to this change.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>

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Rework conditional feature usage

Currently, the infrastructure that we have to enable a flexible
compilation environment has a few issues:

- the allocator configuration is perf

Rework conditional feature usage

Currently, the infrastructure that we have to enable a flexible
compilation environment has a few issues:

- the allocator configuration is performed at run-time, while the log
configuration is performed at compile-time

- for a standard compile (ie, standard userspace, using
autoconf+automake to build), we need a few pre-defined configuration
options.

This change adds a bit of runtime selection to the logging
infrastructure, to match the allocator setup. We also unify the
compile-time defines into config.h, using MCTP_-prefixed macro names,
allowing integration into other build systems.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>

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