refine the structure of paddle_build.sh

paddle/scripts/paddle_build.sh

@@ -115,7 +115,8 @@ function cmake_gen() {
     else
         INFERENCE_DEMO_INSTALL_DIR=${INFERENCE_DEMO_INSTALL_DIR=-/root/.cache/inference_demo}
     fi
-cat <<EOF
+    
+    cat <<EOF
     ========================================
     Configuring cmake in /paddle/build ...
         -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE:-Release}