make building of executables and examples optional in cmake

FreeOpcUa / freeopcua

Open Source C++ OPC-UA Server and Client Library

http://freeopcua.github.io/

GNU Lesser General Public License v3.0

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Open HGeorge-Adapdix opened 1 year ago

HGeorge-Adapdix commented 1 year ago

This removes the requirement of spdlog if you are just trying to build the library.

The defaults are set to ON so that the default behaviour should be unchanged.