trim build log (#3095)

* trim build log

Author: Guihao Liang

scripts/install_python_toolchain.sh

@@ -49,16 +49,26 @@ mkdir -p deps/local/lib
 mkdir -p deps/local/include
 
 pushd deps/local/include
+
+set +x
+echo "run 'ln -Ffs' files from ../../env/include/$PYTHON_FULL_NAME"
 for f in ../../env/include/"$PYTHON_FULL_NAME"/*; do
   ln -Ffs "$f" "$(basename "$f")"
 done
+set -x
+
 popd
 
 mkdir -p deps/local/bin
 pushd deps/local/bin
+
+set +x
+echo "run 'ln -Ffs' on files from ../../env/bin/"
 for f in ../../env/bin/*; do
   ln -Ffs "$f" "$(basename "$f")"
 done
+set -x
+
 popd
 
 linux_patch_sigfpe_handler