tools/tinytest-codegen.py: Add command-line option to exclude tests.

Signed-off-by: Damien George <damien@micropython.org>

tools/tinytest-codegen.py

@@ -108,9 +108,12 @@ argparser = argparse.ArgumentParser(
     description="Convert native MicroPython tests to tinytest/upytesthelper C code"
 )
 argparser.add_argument("--stdin", action="store_true", help="read list of tests from stdin")
+argparser.add_argument("--exclude", action="append", help="exclude test by name")
 args = argparser.parse_args()
 
 if not args.stdin:
+    if args.exclude:
+        exclude_tests += tuple(args.exclude)
     for group in test_dirs:
         tests += [test for test in glob("{}/*.py".format(group)) if test not in exclude_tests]
 else: