Force single thread in runtime smoke

Author: AnastaZIuk

tests/RunLavapipeRuntimeSmoke.cmake

@@ -169,6 +169,7 @@ execute_process(
     "SMOKE_MODULE=${SMOKE_JS_OUT}"
     "SMOKE_EXPORT=${SMOKE_EXPORT}"
     "SMOKE_REQUIRE_RUNTIME_SPIRV=${SMOKE_REQUIRE_RUNTIME_SPIRV}"
+    "LP_NUM_THREADS=1"
     "WEBVULKAN_RUNTIME_EXECUTION_MODE=${SMOKE_RUNTIME_MODE}"
     "WEBVULKAN_RUNTIME_BENCH_ITERATIONS=${SMOKE_RUNTIME_BENCH_ITERATIONS}"
     "WEBVULKAN_RUNTIME_WARMUP_ITERATIONS=${SMOKE_RUNTIME_WARMUP_ITERATIONS}"