This recommended update provides version 4.8.15 for mc:

- Submitting updated mc-4.8.15 to openSUSE:Leap:42.1:update to fix
#boo958072, see fixes in the update changes entry.

- verify the sha256 hash during build

- Tag .sha256 file as source.

- Update to 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)
- rebased mc-extd-xdg.patch against upstream changes