build-unit-test-docker: Fix stdplus gtest support lib

This lib provides some support functions for making googletest routines
more convenient and is used by phosphor-networkd.

Change-Id: I58855538eb94ca7c128c6cee3812cbea09177659
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/scripts/build-unit-test-docker b/scripts/build-unit-test-docker
index 36ecb0f..b0b4a8b 100755
--- a/scripts/build-unit-test-docker
+++ b/scripts/build-unit-test-docker
@@ -255,13 +255,15 @@
     ),
     "openbmc/stdplus": PackageDef(
         depends=[
-            "Naios/function2",
             "fmtlib/fmt",
+            "google/googletest",
+            "Naios/function2",
         ],
         build_type="meson",
         config_flags=[
             "-Dexamples=false",
             "-Dtests=disabled",
+            "-Dgtest=enabled",
         ],
     ),
 }  # type: Dict[str, PackageDef]