Merge pull request #9855 from helinwang/make

make -j nproc when making inference_lib_dist

paddle/scripts/docker/build.sh

@@ -231,7 +231,7 @@ function gen_fluid_inference_lib() {
     Deploying fluid inference library ...
     ========================================
 EOF
-        make inference_lib_dist
+        make -j `nproc` inference_lib_dist
     fi
 }