build-unit-test-docker: Build libpldm stable ABI

Don't include any symbols that are still marked as 'testing' in the
libpldm ABI. No applications should pass CI while relying on symbols
that aren't stable.

See `libpldm: Explicit deprecated, stable and testing ABI classes`[1].

[1]: https://gerrit.openbmc.org/c/openbmc/libpldm/+/63974

Change-Id: Ia99c512566a9d3723e772d64c10d6f82a73b48af
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
diff --git a/scripts/build-unit-test-docker b/scripts/build-unit-test-docker
index 8f902aa..9b0cc34 100755
--- a/scripts/build-unit-test-docker
+++ b/scripts/build-unit-test-docker
@@ -220,6 +220,7 @@
     "openbmc/libpldm": PackageDef(
         build_type="meson",
         config_flags=[
+            "-Dabi=deprecated,stable",
             "-Doem-ibm=enabled",
             "-Dtests=disabled",
         ],