build-unit-test-docker: add cli11 to mapper

One of the applications in the mapper repository is adding a dependency
on cli11.

Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
Change-Id: Id50b701bf94f46b08927beb0fc9d7e187e1f0c47
diff --git a/scripts/build-unit-test-docker b/scripts/build-unit-test-docker
index e2571a7..389cb3c 100755
--- a/scripts/build-unit-test-docker
+++ b/scripts/build-unit-test-docker
@@ -206,6 +206,7 @@
     "openbmc/phosphor-objmgr": PackageDef(
         depends=[
             "boost",
+            "CLIUtils/CLI11",
             "leethomason/tinyxml2",
             "openbmc/phosphor-logging",
             "openbmc/sdbusplus",