updated to 7.4.909

updated to 7.4.909

7.4.900  (after 7.4.899) README file can still be improved
7.4.901  BufLeave autocommand an corrupt undo
7.4.902  problems with using the MS-Windows console
7.4.903  MS-Windows: expandinig wildcards may cause bad memory access
7.4.904  Vim does not provide .desktop files
7.4.905  Python interface misses some functions on vim.message
7.4.906  MS-Windows: viminfo file is (always) given hidden attribute
7.4.907  dynamically loaded libs can only be defined at compile time
7.4.908  (after 7.4.907) build error with MingW compiler
7.4.909  "make install" fails