meson: enable full subproject build

Misc changes to the build process and adding wrap-files so that
the full repository can be built as a meson subproject. This
depends on a few pending changes ups

meson: enable full subproject build

Misc changes to the build process and adding wrap-files so that
the full repository can be built as a meson subproject. This
depends on a few pending changes upstream in phosphor-host-ipmid,
but since that subproject references HEAD it will automatically
resolve as those changes are merged.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Idfe21c8d347c513667d7358af0c4a4ddcf3f181b

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