Import libxo-1.4.0:

• Two changes to encoder options: encoder options may use plus or colon, but only one encoder names can be specified as "@name" This results in the syntax:
  
  df --libxo @csv:no-header:leafs=name.available-blocks /
• If xo_set_program is called before xo_parse_args, honor the requested value
• add xo_errorn* function; repair newline-adding-on-xo_error bug
• test programs now use fixed name, since linux libtool prefixs "lt-"
• Fix "horse butt" comment in source code
• update test cases

PR: 242686