Log Message:
Update mc to 4.8.15:

Version 4.8.15

- Core
  * Minimal version of GLib is 2.26.0
  * Use the PATH environment variable to search for the executable when opening \ 
pipe (#3444)
  * Support more than 2 (up to 9) columns in file panel in brief mode (#3212)
  * Clarify file sorting in "Unsorted" mode (#3496)
  * WGroupbox: respect dialog's colors (#3468)
  * Highlight find file's result in internal viewer (#3530)

- VFS
  * s3 extfs vfs: bugfixes and improvements (#3470, #3502)

- Editor
  * Add hidden option to choose full or base file name in the status line (#3445)
  * Improvements of syntax highlighting:
    - Lua (#3471)
    - PKGBUILD (#3484)

- Misc
  * Text alignment in Info panel (#3155)
  * Select of menu file edit: change default button to "User" (#3493)
  * Recognize .gmo files as well as .mo ones (#3422)
  * Fix mc.pot comment tripping up Transifex and unportable inplace sed (#3479)
  * A lot of code clean up (#3420, #3424, #3426, #3427, #3428, #3429, #3430, \ 
#3431, #3434, #3435, #3437, #3463, #3464, #3465, #3466, #3467, #3494, #3495, \ 
#3539)
  * Documentation updates:
    - Spanish man and help: Diff Viewer section and minor fixes (#3477)
    - VFS garbage collection (#3472)

- Fixes
  * Various memory leaks (#3438, #3439, #3440, #3457, #3458, #3459, #3460, \ 
#3461, #3462, #3475, #3520, #3521, #3522)
  * Linux kernel-specific segfault on startup (#3441)
  * Lost of Panelize contents in some cases (#3032, #3489, #3498, #3507)
  * Wrong highlight of search result in case of "Regular expression" \ 
and "Whole words" (#3524)
  * "Whole words" search works only in Normal mode (#3525)
  * SFTP VFS: segfault (#3456)
  * Segfault in "Find file" due to invalid UTF-8 sequences (#3449)
  * Bash variable 'PROMPT_COMMAND' in  pantheon-terminal (#3534)