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Ensure that static linking of libuuid happens correctly

Sam Thursfield requested to merge samthursfield/buildbox-common:sam/static-link-libuuid into master

We find libuuid via pkg-config, using CMake's FindPkgConfig.cmake module to create an imported target.

As of CMake 3.24, imported targets can only be used for linking shared binaries. Upstream feature request to improve this is: https://gitlab.kitware.com/cmake/cmake/-/issues/21714

In the meantime, we must manually use the STATIC variables set by FindPkgConfig when static linking libuuid, to ensure the link line contains -luuid rather than libuuid.so.

Part of buildbox-integration#1 (closed)

Edited by Sam Thursfield

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