use capture3 instead of popen3

Author: ianfixes

lib/arduino_ci/host.rb

@@ -51,7 +51,15 @@ def self.symlink(old_path, new_path)
       stdout, stderr, exitstatus = Open3.capture3('cmd.exe', "/c mklink /D #{new_path} #{old_path}")
       STDERR.puts stdout
       STDERR.puts stderr
-      exitstatus
+      return exitstatus if new_path.exist?
+
+      STDERR.puts "initial try failed, trying elevated"
+
+      stdout, stderr, exitstatus = Open3.capture3('runas.exe', "/user:administrator", "cmd /C mklink /D #{new_path} #{old_path}")
+
+      STDERR.puts stdout
+      STDERR.puts stderr
+      return exitstatus
     end
   end
 end