Move Win32 TODO items to main TODO list:

Move Win32 TODO items to main TODO list:
<
> * Win32
> 	o Remove per-backend parameter file and move into shared memory?
> 	o Remove configure.in check for link failure when cause is found
> 	o Remove readdir() errno patch when runtime/mingwex/dirent.c rev
> 	  1.4 is released
> 	o Remove psql newline patch when we find out why mingw outputs an
> 	  extra newline
> 	o Allow psql to use readline once non-US code pages work with
> 	  backslashes