Deprecations and amend g_date_time_format_iso8601

Antenore Gatta (tmow) requested to merge ref/minor-fixes into master

Some minor fixes

  • Snap
  • Snap FreeRDP library bump
  • g_date_time_format_iso8601

@donoban I've fixed one of your patch because g_date_time_format_iso8601 is not available for glibc < 2.62

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