Blender Git Loki

=== bugfix win32 - python ===

Fixed BLI_exist: In Windows stat doesn't recognize
a dirname ending is a slash, exept when it's
the root dir ("C:\"), where it is required.
So trailing slashes are only removed when filename
is longer than 3 chars.
Also fixed Python Sys.c that now uses BLI_exist
instead of calling stat directly.