windows: use upper() instead of lower() or os.path.normcase()
this patch uses upper() instead of lower() or os.path.normcase() for
case folding on Windows(NTFS), because lower-ing causes problems for
some languages on it.
see below for detail about problem of lower-ing:
https://blogs.msdn.com/b/michkap/archive/2005/01/16/353873.aspx
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
for software developers.
Basic install:
$ make # see install targets
$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
$ hg # see help
See http://mercurial.selenic.com/ for detailed installation
instructions, platform-specific notes, and Mercurial user information.