build: link with stdc++fs on old GCC versions

pistacheio / pistache

A high-performance REST toolkit written in C++

https://pistacheio.github.io/pistache/

Apache License 2.0

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Closed Tachi107 closed 2 years ago

Tachi107 commented 2 years ago

Fixes #1068

Tachi107 commented 2 years ago

Merging as autopkgtest is based on Debian Testing and ships a new version of GCC that doesn't need -lstdc++fs