fix warning: cp: warning: behavior of -n is non-portable

Author: Jason2866

tools/copy-libs.sh

@@ -435,24 +435,24 @@ for item; do
 			rel_f=${f#*$item}
 			rel_p=${rel_f%/*}
 			mkdir -p "$out_cpath$rel_p"
-			cp -n $f "$out_cpath$rel_p/"
+			cp --update=none $f "$out_cpath$rel_p/"
 		done
 		for f in `find "$item" -name '*.hpp'`; do
 			rel_f=${f#*$item}
 			rel_p=${rel_f%/*}
 			mkdir -p "$out_cpath$rel_p"
-			cp -n $f "$out_cpath$rel_p/"
+			cp --update=none $f "$out_cpath$rel_p/"
 		done
 		for f in `find "$item" -name '*.inc'`; do
 			rel_f=${f#*$item}
 			rel_p=${rel_f%/*}
 			mkdir -p "$out_cpath$rel_p"
-			cp -n $f "$out_cpath$rel_p/"
+			cp --update=none $f "$out_cpath$rel_p/"
 		done
 		# Temporary measure to fix issues caused by https://github.com/espressif/esp-idf/commit/dc4731101dd567cc74bbe4d0f03afe52b7db9afb#diff-1d2ce0d3989a80830fdf230bcaafb3117f32046d16cf46616ac3d55b4df2a988R17
 		if [[ "$fname" == "bt" && "$out_sub" == "/include/$IDF_TARGET/include" && -f "$ipath/controller/$IDF_TARGET/esp_bt_cfg.h" ]]; then
 			mkdir -p "$AR_SDK/include/$fname/controller/$IDF_TARGET"
-			cp -n "$ipath/controller/$IDF_TARGET/esp_bt_cfg.h" "$AR_SDK/include/$fname/controller/$IDF_TARGET/esp_bt_cfg.h"
+			cp --update=none "$ipath/controller/$IDF_TARGET/esp_bt_cfg.h" "$AR_SDK/include/$fname/controller/$IDF_TARGET/esp_bt_cfg.h"
 		fi
 	fi
 done