updated to 7.4.481

7.4.462  Setting the local value of 'backupcopy' empty gives an error
7.4.463  tests 86 and 87 may hang on MS-Windows
7.4.464  (after 7.4.459) compiler warning
7.4.465  crash when expanding a very long string
7.4.466  (after 7.4.460) CTRL-W } does not open preview window
7.4.467  'linebreak' does not work well together with Visual mode
7.4.469  (after 7.4.467) can't build with MSVC
7.4.470  test 11 and 100 do not work properly on Windows
7.4.471  MS-Windows: multi-byte printer name is displayed as ???
7.4.472  drawing "precedes" entry of 'listchar' when 'list' is not set
7.4.473  cursor position incorrect with number column and 'sbr'
7.4.474  AIX compiler can't handle // comment
7.4.475  can't compile if Xutf8SetWMProperties() is not in X11 library
7.4.476  MingW: compiling with "XPM=no" doesn't work
7.4.477  ":%diffput" adds an empty line if the other file is empty
7.4.478  using byte length instead of character length for 'showbreak'
7.4.479  MS-Windows: The console title can be wrong
7.4.480  (after 7.4.479) MS-Windows: Can't build
7.4.481  (after 7.4.471) compiler warning on MS-Windows