Log Message:
gexiv2: update to 0.12.2

gexiv2 0.12.2 - 20 Feb 2021

 * Introduce gexiv2_metadata_get_exif_data
 * Clarify License of C/C++ code
 * Documentation clean-up
 * Fix filename handling for windows
 * Fix _get_iptc_tags returning duplicates
 * Add _get_multiple() for all tag domains
 * Introduce a set of new functions that will pass on Exiv2's exception
   instead of silently dropping a warning to the console
 * Fix XMP tags sort order
 * Fix xmpText/altLang handling for _get_tag_multiple()
 * Add XMP namespace lookup
 * Windows compatibility fixes

Bugs fixed in this release:
 - https://gitlab.gnome.org/GNOME/gexiv2/issues/10
 - https://gitlab.gnome.org/GNOME/gexiv2/issues/57
 - https://gitlab.gnome.org/GNOME/gexiv2/issues/58
 - https://gitlab.gnome.org/GNOME/gexiv2/issues/59
 - https://gitlab.gnome.org/GNOME/gexiv2/issues/59
 - https://gitlab.gnome.org/GNOME/gexiv2/issues/60
 - https://gitlab.gnome.org/GNOME/gexiv2/issues/61
 - https://gitlab.gnome.org/GNOME/gexiv2/issues/63