Fix MANPATH.

Index: setup.py
--- setup.py.orig
+++ setup.py
@@ -472,7 +472,7 @@ if not windows_check() and not osx_check():
             ),
             ('share/pixmaps', ['deluge/ui/data/pixmaps/deluge.png']),
             (
-                'share/man/man1',
+                'man/man1',
                 [
                     'docs/man/deluge.1',
                     'docs/man/deluged.1',