build-unit-test-docker: Build gpioplus with meson

The autotools build will eventually be deleted so we should use meson
instead since that is now the primary build system.

Change-Id: I75281d4c5e287dba77f5aa3037569d9c5487ca3f
Signed-off-by: William A. Kennington III <wak@google.com>
1 file changed