Fix compatibility with Boost 1.89 (!23) · Merge requests · UBports / Development / Core / lib-cpp / persistent-cache-cpp

Boost.System library was removed in 1.89. It was turned into a header-only component with only a stub library in Boost 1.69 (2018).

https://www.boost.org/releases/1.89.0/

https://www.boost.org/releases/1.69.0/

There is already a find_package(Boost COMPONENTS filesystem REQUIRED) call in the top-level CMakeLists.txt, so having another one here (without the REQUIRED part) is pointless.

Fix compatibility with Boost 1.89

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