hg-ssh: normalize the drive of the current working directory on windows

For some reason os.getcwd() can return either `c:` or `C:`. We normalize this to
`C:` and the like. This fix `test-ssh-bundle1.t` on windows.

Differential Revision: https://phab.mercurial-scm.org/D11042

contrib/hg-ssh

@@ -31,6 +31,7 b' command="hg-ssh --read-only repos/*"'
 from __future__ import absolute_import
 
 import os
+import re
 import shlex
 import sys
 
@@ -51,6 +52,12 b' def main():'
     dispatch.initstdio()
 
     cwd = os.getcwd()
+    if os.name == 'nt':
+        # os.getcwd() is inconsistent on the capitalization of the drive
+        # letter, so adjust it. see https://bugs.python.org/issue40368
+        if re.match('^[a-z]:', cwd):
+            cwd = cwd[0:1].upper() + cwd[1:]
+
     readonly = False
     args = sys.argv[1:]
     while len(args):