DOC: Normalize symlink target

Kojoley · Kojoley · commit 7e607882b774 · 2016-10-24T17:37:23.000+03:00
Fixes `OSError: [WinError 123] The filename, directory name,
or volume label syntax is incorrect` error on docs build.
diff --git a/doc/make.py b/doc/make.py
@@ -178,7 +178,7 @@ def all():
                                " isn't".format(link))
     if not os.path.exists(link):
         try:
-            os.symlink(target, link)
+            os.symlink(os.path.normcase(target), link)
         except OSError:
             symlink_warnings.append('files copied to {0}'.format(link))
             shutil.copytree(os.path.join(link, '..', target), link)
