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>
diff --git a/build-unit-test-docker.sh b/build-unit-test-docker.sh
index 7674bfa..361bed8 100755
--- a/build-unit-test-docker.sh
+++ b/build-unit-test-docker.sh
@@ -320,10 +320,9 @@
 FROM openbmc-base as openbmc-gpioplus
 RUN curl -L https://github.com/openbmc/gpioplus/archive/${PKG_REV['gpioplus']}.tar.gz | tar -xz && \
 cd gpioplus-* && \
-./bootstrap.sh && \
-./configure ${CONFIGURE_FLAGS[@]} --disable-tests --disable-examples && \
-make -j$(nproc) && \
-make install
+meson build -Dprefix=${PREFIX} -Dtests=disabled -Dexamples=false && \
+ninja -C build && \
+ninja -C build install
 
 FROM openbmc-base as openbmc-phosphor-dbus-interfaces
 COPY --from=openbmc-sdbusplus ${PREFIX} ${PREFIX}