scripts/unit-test: Add meson support
scripts/unit-test: Add meson support

Tested:
    Converted sdeventplus to meson as a demo to make sure this works as
    expected.

Change-Id: I5a518cf6e7d574468c4a6529780ec1d91e9bf7df
Signed-off-by: William A. Kennington III <30fff5198f4d10ca1117e5f3ec82f3b4b8900d81@google.com>

openbmc/openbmc-build-scripts,openbmc/openbmc-build-scripts