CMake pkgconfig does not find libgit2 1.01 in LCG nightlies (dev4)

libgit2 1.0.1 is installed in LCG dev4 in the directory lib64 but when using CMake toolchains CMake only looks into lib directories.

The nightlies are working because we pick up the system version of libgit2 (installed in the Docker containers we use for the builds).

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