[geary: 3/3] Merge branch 'optional_libunwind' into 'master'

[Michael Gratton <mjog src gnome org>]

commit 8081f46621e3e9412a036a4075ff077b96227b52
Merge: ac6c369d b120525f
Author: Michael Gratton <mike vee net>
Date:   Wed Feb 20 01:43:47 2019 +0000

    Merge branch 'optional_libunwind' into 'master'
    
    Allow to opt-out from using libunwind.
    
    See merge request GNOME/geary!109

 meson.build                             | 31 ++++++++++++++++---------------
 meson_options.txt                       |  1 +
 src/engine/meson.build                  | 11 ++++++++++-
 src/engine/util/util-error-context.vala |  4 ++++
 4 files changed, 31 insertions(+), 16 deletions(-)
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