asterisk: bump to 18.14.0

asterisk: bump to 18.14.0

- add new modules
- res-geolocation depends on asterisk being built with libxlt support,
  but to make libxslt a general dependency is probably not a good idea
  for small devices, so this adds a config option
  ASTERISK_LIBXSLT_SUPPORT that is off by default except on x86_64
  builds
- correct some module titles by removing the extraneous "support" string
- refresh patches
- 170-time-add-support-for-time64-libcs.patch,
  180_build-fix-bininstall-launchd-issue-on-cross-platfrom.patch and
  190-logger-workaround-woefully-small-BUFSIZ-in-MUSL.patch removed as
  included in upstream release
- added 170-menuselect-force-use-of-xml2-config.patch as upstream
  switched to use pkg-config for libxml2 detection, which would be fine,
  except OpenWrt's host libxml2 is static and Asterisk can't handle that

Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>