[Users] [Bug 3764] New: Use external libical instead of the internal copy

[noreply at thewildbeast.co.uk]

http://www.thewildbeast.co.uk/claws-mail/bugzilla/show_bug.cgi?id=3764

            Bug ID: 3764
           Summary: Use external libical instead of the internal copy
    Classification: Unclassified
           Product: Claws Mail
           Version: GIT
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: Plugins/vCalendar
          Assignee: users at lists.claws-mail.org
          Reporter: flo.xfce at gmx-topmail.de

The vcalendar plugin relies on libical, which is provided in-tree. However,
this included version is outdated. I am not aware of any security related
issues with libical at the moment, but using the upstream version of libical
can prevent some security issues should they arise (users only have to update
libical, not claws-mail).
The attached patch removes the in-tree version of libical and fixes the build
to use an external version of libical. This patch also bumps the minimum
dependency of libical to version 2.0 and a few code lines were adjusted
accordingly.
The patch is only tested on Linux. I do not know if Windows or OS X build were
broken.

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