FinKexiv2: Use FindPkgConfig instead of UsePkgConfig

Review Request #123437 - Created April 20, 2015 and submitted - Latest diff uploaded

Information
Heiko Becker
kdelibs
KDE/4.14
fc83724...
Reviewers
buildsystem, kdelibs
The latter is deprecated and doesn't respect the PKG_CONFIG
environment variable which makes it easy to deal with differently
named pkg-config executables, e.g. arch-prefixed ones.
I built okular and checked that it finds and links against libkexiv2.
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