cmake Exiv2 examples

KDE/digikam core/CMakeLists.txt :250 

find_package(Exiv2 ${EXIV2_MIN_VERSION})

Stellarium/stellarium plugins/LensDistortionEstimator/src/CMakeLists.txt :1 

FIND_PACKAGE(exiv2)

darktable-org/darktable src/CMakeLists.txt :449 

find_package(Exiv2 0.27.2 REQUIRED)