scripts/build-unit-test-docker: mapper + meson
scripts/build-unit-test-docker: mapper + meson

Patches to remove autotools support from the mapper are in progress.
Switch to meson to prepare for that eventuality.

Change-Id: I21662fdd3f2f2af545c0aeecd12a51e817ca97fb
Signed-off-by: Brad Bishop <713d098c0be4c8fd2bf36a94cd08699466677ecd@fuzziesquirrel.com>

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