build: Add meson support

Add support for buildling with meson.

Support for --enable-oe-sdk is dropped because running unit tests on the
build system is now supported directly wi

build: Add meson support

Add support for buildling with meson.

Support for --enable-oe-sdk is dropped because running unit tests on the
build system is now supported directly with meson subprojects:

meson buildir && ninja -C buildir test

I tested this by building a witherspoon image and booting it to
multi-user and verifying the mapper-wait functionality works correctly.

Change-Id: I86e5efc7b7c89183219a4c890ad658e334765fc1
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>

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