Log Message:
Updated mc to 4.8.18.

Version 4.8.18

- Core
  * Alt-Enter, Ctrl-Enter and Ctrl-Shift-Enter shortcuts are bindable in file \ 
manager (#3075)
  * Internals:
    * Refactoring of widget subsystem (#2919, #3632)

- Editor
  * Add syntax highlighting:
    * GLSL (#3683)
    * CUDA (#3686)

- Misc
  * Code cleanup (#3641, #3652)

- Fixes
  * Build failure on FreeBSD (#3643)
  * Incompatibility with NetBSD curses (#3665)
  * Memory leaks (#3637)
  * Subshell output lost on window resize under tmux, GNU screen (#3639)
  * --with-subshell=optional does not work (#3642)
  * Backward search is not interruptible (#3648)
  * "Output lines" has no effect (#3655)
  * Wrong handling of mouse clicks in long listing mode (#3661)
  * Panelize resets marks on marked files in many cases (#3663)
  * Cannot change directory in the active panel in some cases (#3669)
  * Filtered View doesn't work (#3646, #3660)
  * mcedit: don't kill bookmarks when open file from "Find File" \ 
dialog (#3668)
  * man pages use "the MC" instead of "MC" (#3644)