updated for version 7.4.122
Problem:    Win32: When 'encoding' is set to "utf-8" and the active codepage
	    is cp932 then ":grep" and other commands don't work for multi-byte
	    characters.
Solution:   (Yasuhiro Matsumoto)
Added tag v7-4-122 for changeset 270c62fe685a
updated for version 7.4.123
Problem:    Win32: Getting user name does not use wide function.
Solution:   Use GetUserNameW() if possible. (Ken Takata)
Added tag v7-4-123 for changeset 32e50f85d2c7
updated for version 7.4.124
Problem:    Win32: Getting host name does not use wide function.
Solution:   Use GetComputerNameW() if possible. (Ken Takata)
Added tag v7-4-124 for changeset 9faba192ea90