Don't archive preexisting archives if commandline is too long

Fixes https://github.com/arduino-libraries/ArduinoIoTCloud/runs/1693000682?check_suite_focus=true#step:7:277
Should revert arduino-libraries/ArduinoIoTCloud#222

Author: facchinm

legacy/builder/phases/linker.go

@@ -78,6 +78,10 @@ func link(ctx *types.Context, objectFiles paths.PathList, coreDotARelPath *paths
 		properties := buildProperties.Clone()
 		archives := paths.NewPathList()
 		for _, object := range objectFiles {
+			if object.HasSuffix(".a") {
+				archives.Add(object)
+				continue
+			}
 			archive := object.Parent().Join("objs.a")
 			if !archives.Contains(archive) {
 				archives.Add(archive)