fix build command

ci.hocon

@@ -58,7 +58,7 @@ benchRun: ${common} ${java8Downloads} {
     ["git", "clone", "ssh://git@ol-bitbucket.us.oracle.com:7999/g/r-apptests.git",  "../r-apptests"]
     ["git", "clone", "ssh://git@ol-bitbucket.us.oracle.com:7999/g/r-benchmarks.git",  "../r-benchmarks"]
     ["git", "clone", "ssh://git@ol-bitbucket.us.oracle.com:7999/g/graal-core.git",  "../graal-core"]
-    ["mx", "build"]
+    [mx, --vm, server, --vmbuild, product, --dynamicimport, graal-core, --strict-compliance, build, -p, --force-javac]
     ["mx", "--dynamicimport", "r-benchmarks,r-apptests,graal-core", "benchmark", "--results-file", "results.json"]
     ["bench-uploader.py", "--url", "$BENCH_SERVER_URL", "results.json"]
   ]