Log Message:
mc: update to 4.8.21.

Version 4.8.21

- Core

  * Cancel Chmod/Chown/Advanced chown operation for large group of files when \ 
operation is not permitted (#3850)
  * Mouse support in the "Advanced chown" dialog window (#3148)
  * File highlighting by extension is case insensitive by default (#1620)
  * Safe file overwrite (#3913)

- VFS

  * Support zstd compression format (#3906)

- Editor

  * Syntax:
    * Rust support (#3884)
    * JavaScript modules support (#3890)
    * Improve Markdown support (#3893)

- Misc

  * Add JavaScript module support to `filehighlight.ini` (MidnightCommander/mc#132)
  * Add Excel xlsx file format support to `mc.ext.in` (MidnightCommander/mc#135)
  * i18n of argument type names in --help blocks (#3879)
  * Code cleanup: (#3857, #3914)

- Fixes

  * Fail to link to ncurses built as two libraries: ncurses+tinfo (#3880)
  * Garbage in displaying of summary of file sizes for selected files (#3883)
  * "Compute totals" unnecessarily done for moves (#3149, #3908)
  * mc.ext: allow Java class files to be viewed even if JAD isn't on PATH \ 
(MidnightCommander/mc#134)
  * mcedit: broken extended key mode (#3897)
  * mcedit doesn't save all opened files (#3898)
  * extfs: sftps: -31 SFTP Protocol Error when transferring file (#3406)
  * extfs: rpm: truncated script content in the viewer (#3865)
  * extfs: rpm helper misses CONFLICTS field (#3789)