Update Python download scripts to use makedirs

Change-Id: Ia2d4da95bc1ffb1b449d2b5972926d6cc927e982

download_iree_compiler.py

diff --git a/download_iree_compiler.py b/download_iree_compiler.py
index 8095a60..7ecae06 100755
--- a/download_iree_compiler.py
+++ b/download_iree_compiler.py
@@ -29,7 +29,7 @@
 
     print("\nDownload %s from %s\n" % (artifact_name, download_url))
     if not os.path.isdir(out_dir):
-        os.mkdir(out_dir)
+        os.makedirs(out_dir)
     out_file = os.path.join(out_dir, artifact_name)
 
     num_retries = 3
@@ -117,7 +117,7 @@
     # Extract the tarball to ${iree_compiler_dir}/install
     install_dir = iree_compiler_dir / "install"
     if not install_dir:
-        os.mkdir(install_dir)
+        os.makedirs(install_dir)
 
     tar = tarfile.open(tar_file)
     tar.extractall(path=install_dir)

download_renode.py

diff --git a/download_renode.py b/download_renode.py
index 4c35e99..4858cb4 100755
--- a/download_renode.py
+++ b/download_renode.py
@@ -17,7 +17,7 @@
 def download_artifact(url, artifact_name, out_dir):
     """Download the artifact from url."""
     if not os.path.isdir(out_dir):
-        os.mkdir(out_dir)
+        os.makedirs(out_dir)
     out_file = os.path.join(out_dir, artifact_name)
     download_url = os.path.join(url, artifact_name)
     num_retries = 3
@@ -101,7 +101,7 @@
 
     renode_dir = Path(args.renode_dir)
     if not os.path.isdir(renode_dir):
-        os.mkdir(renode_dir)
+        os.makedirs(renode_dir)
     tag_file = renode_dir / "tag"
 
     # Check the tag of the existing download.