[win32] fix the following error on Windows 'uname' is not recognized as an internal or external command, operable program or batch file.
[win32] fix the following error on Windows
'uname' is not recognized as an internal or external command, operable program or batch file.

git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@45706 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot