Allow using system lib for all submodules #818
Merged
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libdatachannel requires usrsctp, Plog and Nlohmann JSON (examples only) submodules.
This PR enable in CMake using system lib for those and add an option
PREFER_SYSTEM_LIB
to enable allUSE_SYSTEM_
.This change allows libdatachannel to be built and packaged on Debian and Fedora build-systems by packaging and providing all the dependencies independently since those build-systems do not support git submodules.