make_metadata.py: Remove current dir from sys.path.

Otherwise MicroPython will pick up glob as an empty namespace package from
the current dir otherwise.

make_metadata.py

@@ -1,6 +1,11 @@
 #!/usr/bin/env python3
+# MicroPython will pick up glob from the current dir otherwise.
+import sys
+sys.path.pop(0)
+
 import glob
 
+
 TEMPLATE = """\
 import sys
 # Remove current dir from sys.path, otherwise setuptools will peek up our