[mono] mono 4.2.2 breaks with 'segmentation fault'

[mediocaballero]

Issue description:
I need a more up-to-date version of mono than the official Synology beta (4.2.1).
Tried SynoCommunity one (reported as 4.2.2). It downloads, installs and seems to be running, but whenever I try to run something (even just checking the version) it breaks with a 'segmentation fault' error.

Console output:

admin@NAS:/usr/local/mono/bin$ ./mono --version
Segmentation fault

Model: DS215j
Architecture: MARVELL Armada 375 88F6720
DSM version: DSM 6.0-7321 Update 3
Log file: n/a

[Dr-Bean]

Please follow the guidelines when opening a new issue: https://github.com/SynoCommunity/spksrc/blob/master/CONTRIBUTING.md#issue-content

[mediocaballero]

Updated following guidelines. Thanks!

[Dr-Bean]

Waiting on #2296.

[Dr-Bean]

I've published a new set of Mono 4.6.2.7-8 packages for DSM6, available on the beta channel (maybe not immediately, but it should show up at some point)
Maybe one of you can check if the segfault issue is solved with those packages.
Note that the package won't show up as an update in Package Center, the previous package will have to be removed first.

[Safihre]

Mono is now at 5.8.0, so assuming these issues to be fixed.