Check for shared ENet if USE_SHARED_ENET is set

[rootkea]

Check for shared ENet if USE_SHARED_ENET is set

[rootkea]

BTW, ENet provides libenet.pc so maybe we can use pkg-config within cmake instead of maintaining our own FindENet.cmake?

1. https://stackoverflow.com/questions/29191855/what-is-the-proper-way-to-use-pkg-config-from-cmake
2. https://cmake.org/cmake/help/latest/module/FindPkgConfig.html

[rootkea]

Moreover, I'm sorry but is there a strong a reason to maintain our own ENet in cdogs-sdl source? I mean upstream seems pretty active. Why aren't we upstreaming our ENet patches https://github.com/cxong/cdogs-sdl/commits/master/src/cdogs/enet ? It should ease the maintenance and also good for FLOSS. :)

[rootkea]

I did find FindENet.cmake at https://github.com/stuntrally/stuntrally/blob/master/cmake/FindENet.cmake but I'm a cmake newbie so not sure exactly which part is relevant to us...

[reinerh]

BTW, ENet provides libenet.pc so maybe we can use pkg-config within cmake instead of maintaining our own FindENet.cmake?

In my opinion using pkg-config to find ENet would be better than writing and maintaining a custom CMake module that searches it.

[cxong]

It would be good to upstream any changes, but testing enet / networking is a lot of work, happy if anyone else is willing to look at it