change make nproc on Cloud Integration (#21350)

paddle/scripts/paddle_build.sh

@@ -280,7 +280,11 @@ function check_style() {
 
 function build_base() {
     if [ "$SYSTEM" == "Linux" ];then
-      parallel_number=`nproc`
+      if [ `nproc` -gt 16 ];then
+          parallel_number=$(expr `nproc` - 4)
+      else
+          parallel_number=`nproc`
+      fi
     else
       parallel_number=8
     fi