Message12754

This bug affects also functions that use `os.path.abspath` internally such as `os.path.relpath`:

>>> os.path.relpath(r'\foo\bar', r'c:\temp')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\jython2.7.2b2\Lib\ntpath.py", line 511, in relpath
    raise ValueError("path is on drive %s, start on drive %s"
ValueError: path is on drive , start on drive c:


The above works fine with CPython and Jython 2.7.1 and the result is `..\foo\bar`.