xutils.c: Under the following conditions

xutils.c: Under the following conditions
- Select diff algorithm other than 'default'
- Enable 'Ignore changes' or 'Ignore all' in 'Whitespace' group (XDF_IGNORE_WHITESPACE_CHANGE or XDF_IGNORE_WHITESPACE)
- EOL on the last line of the file does not exist on the other side but has the same content
libxdiff assumes that the last line is not different. However, it is not compatible with WinMerge. So I correct as there is a difference.