This update for calamares fixes the following issues:

- Reflect the changed path to LiveOS read-only filesystem in KIWI-ng (KIWI 9)
(boo#1124451).
- BuildRequires libboost_python3-devel for Leap 15.0 and newer
instead of boost-devel (boo#1124423, upstream issue 817).
- Fix building for openSUSE Leap 42.3 by switching to GCC7.

- Update to Calamares 3.1.11:
- fix bug then some poorly-configured systems cannot reliably set
the hardware clock (RTC). Previously this was an error which
would abort the entire installation. Calamares now ignores the
error.