ensure that the directory must be created before writing the file

Author: smdn

src/Smdn.MSBuild.DefineConstants.NETSdkApi/APIList.targets

@@ -79,6 +79,7 @@ SPDX-License-Identifier: MIT
     </ParameterGroup>
     <Task>
       <Code Type="Fragment" Language="cs"><![CDATA[
+System.IO.Directory.CreateDirectory(System.IO.Path.GetDirectoryName(Path));
 System.IO.File.WriteAllText(Path, Content, System.Text.Encoding.Default /* no bom */);
 ]]></Code>
     </Task>