Commit a8c3455e5c and
commit eb05551ed2 changed the target of
the exiv2 library ("exiv2lib"), exporting it in the "Exiv2" namespace,
so making it usable as "Exiv2::exiv2lib" instead. An ALIAS to "exiv2lib"
was added, however cmake does not install or export ALIAS targets [1].
Hence, restore compatibility with the existing cmake users of exiv2:
manually create an ALIAS target in the cmake config files after all the
targets are loaded and checked.
[1] https://cmake.org/cmake/help/latest/command/add_library.html
Pino Toscano
Ryan Friedman