Make path references OS independent

Change-Id: I5573995adfd52fd54bddc62d1d1ea78fb1328130
diff --git a/manifest_xml.py b/manifest_xml.py
index d888653..35318d0 100644
--- a/manifest_xml.py
+++ b/manifest_xml.py
@@ -357,7 +357,7 @@
       worktree = None
       gitdir = os.path.join(self.topdir, '%s.git' % name)
     else:
-      worktree = os.path.join(self.topdir, path)
+      worktree = os.path.join(self.topdir, path).replace('\\', '/')
       gitdir = os.path.join(self.repodir, 'projects/%s.git' % path)
 
     project = Project(manifest = self,